Question

Помогите хоть с чем-то пожалуйста! 1. Решите систему уравнений с помощью графика ( хотя бы без графика если можно помогите пожалуйста ). {х-2y=4 {7х-2y=8 2. Решите систему способом сложения {4х+2y=24 {7x-2y=31 3. Решите задачу.. Пусть легковых -х, когда грузовых 8+y. Составим и решим уравнение. 4.. Сколько решений имеет система? {-x+2y=8 {x+4y=10 ЗАРАНЕЕ ОГРОМНОЕ СПАСИБО. Смотреть ответ Да у меня условия просто нет.. Поэтому это как с условия уже составляется.. Но спасибо. дальше некорректность, поэтому не могу может даже всё если исправите, решу парочку заданий не полностью она Ерофейка Ерофейка 1) {х-2у=4 {7х-2у=8 Можно использовать метод сложения: {-2у+х=4 {2у-7х=-8 (домножили на -1) 0-6х=-4 х=4/6=2/3 найдём у: 2/3-2у=4 -2у=4-2/3 -2у=10/3 у= -(10/3)/2 у= -5/3 Ответ: х=2/3;у=-5/3 2){4х+2y=24 {7x-2y=31 11х=55 х=5 найдём у: 4×5+2у=24 20+2у=24 2у=4 у=2 Ответ: х=5;у=2 Новые вопросы в Алгебра Замiнiть зірочку степенем з основою а так, щоб утворилася правильна рівність: 1) all. *= a19; 2) a³. *. a = a²5 ; 4) *: a19 = a23 ; 3) a14 :*= a6; Обч … исліть значення виразу (у разі потреби скористайтеся таблицями степенів чисел 2 і 3, квадратів двоцифрових чисел, кубiв одноцифрових чисел): 1) 2²-2³; 2) 3¹5.3¹1; 3) 59-5³:510; 4) 11¹¹:11¹0-11; 16 5) (1#)" (¹#)" ¹ #: Подайте у вигляді степеня вираз: 4) (m3)4; 1) (24)3; 2) (102 5) ((a7)3)2; 3) m'm4 . 6) (aº)³. (a²)4; 6) 5) *: a7 .all = a18; 6) a:*:a=a³. 7) 715 712 7² (0,2) ¹ (0,2) (0,2)¹5.(0,2)6 7) (-a5)3 . (-a4)7 : a12; 8) a32 : (a)3 . a. срочно дам 60 балов​ даю 45б задание на картинке 0, 6 ÷ 8 + 1,9 х 0,75 11,25 - 6 5/6 8 5/6 помогите пожалуйста мне нужно поэтапно ​ Упросить выражение (√7 + √3)^2​ a3 + 3a² + 2 ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНОО​ Предыдущий Следующий Вместе мы знаем больше КОМПАНИЯ Блог Карьера Условия пользования Авторское право Политика конфиденциальности Предпочтения cookie-файлов СООБЩЕСТВО Сообщество Brainly Brainly для школ и учителей Сообщество родителей Кодекс чести Правила сообщества Brainly Insights Стань помощником ПОМОЩЬ Зарегистрируйся Центр помощи Центр безопасности Договор о конфиденциальности полученной информации Установи приложение Brainly Скачай iOS-приложение Скачай для Android Школьные Знания.com PL: Brainly.pl ES: Brainly.lat PT: Brainly.com.br FR: Nosdevoirs.fr TR: Eodev.com RO: Brainly.ro ID: Brainly.co.id HI: Brainly.in PH: Brainly.ph US: Brainly.com (function() { window.process = window.process || {}; window.process.env = { NEXT_PUBLIC_PAYMENTS_ENDPOINT: "https://znanija.com/graphql/ru", NEXT_PUBLIC_HEADER_TOKEN_LONG: 'X-B-Token-Long', NEXT_PUBLIC_COOKIE_TOKEN_LONG: 'Zadanepl_cookie[Token][Long]', NEXT_PUBLIC_MARKET: "ru", NEXT_PUBLIC_BACKEND_MARKET: "ru", NEXT_PUBLIC_SPREEDLY_PKEY: "", NEXT_PUBLIC_PAYMENTOS_PKEY: "7a985100-4936-430e-83cf-af6ea914af9b", NEXT_PUBLIC_STRIPE_PKEY: "", NEXT_PUBLIC_BRAINTREE_PKEY: "", NEXT_PUBLIC_ENV: 'production' }; window.jsData = window.jsData || {}; window.jsData.domain = 'znanija.com'; window.jsData.siteName = 'Школьные Знания.com'; window.jsData.dateFormat = 'd.m.Y'; window.jsData.footerConfig = {"socialMedia":[{"icon":"youtube","url":"https:\/\/www.youtube.com\/channel\/UCQ929YFR7IGeKlv-nXn-Qug?view_as=subscriber","ariaLabel":"youTube link"}],"company":[{"titleTranslationKey":"blog_footer_link","url":"https:\/\/blog.znanija.com"},{"titleTranslationKey":"careers_footer_link","url":"https:\/\/careers.brainly.com\/"},{"titleTranslationKey":"terms_of_use_footer_link","url":"https:\/\/znanija.com\/pages\/prawila","noHref":true},{"titleTranslationKey":"copyright_policy_footer_link","url":"https:\/\/znanija.com\/avtorskoe-pravo"},{"titleTranslationKey":"privacy_policy_footer_link","url":"https:\/\/znanija.com\/pages\/politika_konfidentsialnosti"},{"titleTranslationKey":"cookie_privacy_footer_link","handlerKey":"cookie_privacy_footer_link"}],"community":[{"titleTranslationKey":"brainly_community_footer_link","url":"https:\/\/znanija.com\/soobshestvo"},{"titleTranslationKey":"for_schools_teachers_footer_link","url":"https:\/\/znanija.com\/shkola-i-uchitelia"},{"titleTranslationKey":"brainly_for_parents_footer_link","url":"https:\/\/znanija.com\/roditeli"},{"titleTranslationKey":"honor_code_footer_link","url":"https:\/\/znanija.com\/kodeks-chesti"},{"titleTranslationKey":"community_guidelines_footer_link","url":"https:\/\/znanija.com\/pravila-soobshestva","noHref":true},{"titleTranslationKey":"brainly_insights_footer_link","url":"https:\/\/brainly.com\/insights"},{"titleTranslationKey":"become_a_volunteer_footer_link","url":"https:\/\/znanija.com\/volontery"}],"helpColumn":[{"titleTranslationKey":"signup_footer_link","url":"https:\/\/znanija.com\/signup?entry=1","noHref":true},{"titleTranslationKey":"help_center_footer_link","url":"https:\/\/faq-ru.brainly.com"},{"titleTranslationKey":"safety_center_footer_link","url":"https:\/\/znanija.com\/centr-bezopasnosti"},{"titleTranslationKey":"responsible_disclosure_agreement_footer_link","url":"https:\/\/brainly.com\/responsible-disclosure-program"}]}; window.jsData.styleGuideAssets = { logo: { small: 'https://styleguide.znanija.com/images/logos/znanija-mobile-200611d052.svg', big: 'https://styleguide.znanija.com/images/logos/znanija-addd85e6f5.svg', plus: 'https://styleguide.znanija.com/images/logos/znanija-plus-337423fa26.svg' }, application_icons: { x180: 'https://styleguide.znanija.com/images/app-icons/znanija/180x180-1c0ebd78f4.png', } }; window.jsData.staticDomain = 'z-dn.net' window.jsData.displayAdsEnabled = false window.jsData.videoAdsEnabled = false window.jsData.newestQuestions = [{"id":53803115,"content":"\u0417\u0430\u043ci\u043di\u0442\u044c \u0437\u0456\u0440\u043e\u0447\u043a\u0443 \u0441\u0442\u0435\u043f\u0435\u043d\u0435\u043c \u0437 \u043e\u0441\u043d\u043e\u0432\u043e\u044e \u0430 \u0442\u0430\u043a, \u0449\u043e\u0431 \u0443\u0442\u0432\u043e\u0440\u0438\u043b\u0430\u0441\u044f \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u0430 \u0440\u0456\u0432\u043d\u0456\u0441\u0442\u044c: 1) all. *= a19; 2) a\u00b3. *. a = a\u00b25 ; 4) *: a19 = a23 ; 3) a14 :*= a6; \u041e\u0431\u0447\u0438\u0441\u043b\u0456\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044f \u0432\u0438\u0440\u0430\u0437\u0443 (\u0443 \u0440\u0430\u0437\u0456 \u043f\u043e\u0442\u0440\u0435\u0431\u0438 \u0441\u043a\u043e\u0440\u0438\u0441\u0442\u0430\u0439\u0442\u0435\u0441\u044f \u0442\u0430\u0431\u043b\u0438\u0446\u044f\u043c\u0438 \u0441\u0442\u0435\u043f\u0435\u043d\u0456\u0432 \u0447\u0438\u0441\u0435\u043b 2 \u0456 3, \u043a\u0432\u0430\u0434\u0440\u0430\u0442\u0456\u0432 \u0434\u0432\u043e\u0446\u0438\u0444\u0440\u043e\u0432\u0438\u0445 \u0447\u0438\u0441\u0435\u043b, \u043a\u0443\u0431i\u0432 \u043e\u0434\u043d\u043e\u0446\u0438\u0444\u0440\u043e\u0432\u0438\u0445 \u0447\u0438\u0441\u0435\u043b): 1) 2\u00b2-2\u00b3; 2) 3\u00b95.3\u00b91; 3) 59-5\u00b3:510; 4) 11\u00b9\u00b9:11\u00b90-11; 16 5) (1#)\" (\u00b9#)\" \u00b9 #: \u041f\u043e\u0434\u0430\u0439\u0442\u0435 \u0443 \u0432\u0438\u0433\u043b\u044f\u0434\u0456 \u0441\u0442\u0435\u043f\u0435\u043d\u044f \u0432\u0438\u0440\u0430\u0437: 4) (m3)4; 1) (24)3; 2) (102 5) ((a7)3)2; 3) m'm4 . 6) (a\u00ba)\u00b3. (a\u00b2)4; 6) 5) *: a7 .all = a18; 6) a:*:a=a\u00b3. 7) 715 712 7\u00b2 (0,2) \u00b9 (0,2) (0,2)\u00b95.(0,2)6 7) (-a5)3 . (-a4)7 : a12; 8) a32 : (a)3 . a. \u0441\u0440\u043e\u0447\u043d\u043e \u0434\u0430\u043c 60 \u0431\u0430\u043b\u043e\u0432\u200b"},{"id":53802995,"content":"\u0434\u0430\u044e 45\u0431\n\u0437\u0430\u0434\u0430\u043d\u0438\u0435 \u043d\u0430 \u043a\u0430\u0440\u0442\u0438\u043d\u043a\u0435"},{"id":53802980,"content":"0, 6 \u00f7 8 + 1,9 \u0445 0,75 11,25 - 6 5\/6 8 5\/6 \u043f\u043e\u043c\u043e\u0433\u0438\u0442\u0435 \u043f\u043e\u0436\u0430\u043b\u0443\u0439\u0441\u0442\u0430 \u043c\u043d\u0435 \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u044d\u0442\u0430\u043f\u043d\u043e \u200b"},{"id":53802965,"content":"\u0423\u043f\u0440\u043e\u0441\u0438\u0442\u044c \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0435 (\u221a7 + \u221a3)^2\u200b"},{"id":53802961,"content":"a3 + 3a\u00b2 + 2 \u041f\u041e\u041c\u041e\u0413\u0418\u0422\u0415 \u041f\u041e\u0416\u0410\u041b\u0423\u0419\u0421\u0422\u0410 \u0421\u0420\u041e\u0427\u041d\u041e\u041e\u200b"}] window.jsData.nearestQuestions = { next: { url: '/task/29076811', id: '29076811' }, prev: { url: '/task/29076808', id: '29076808' } } window.jsData.userLocationInfo = {"location":{"continent":{"code":"AS","geoname_id":6255147,"names":{"de":"Asien","en":"Asia","es":"Asia","fr":"Asie","ja":"\u30a2\u30b8\u30a2","pt-BR":"\u00c1sia","ru":"\u0410\u0437\u0438\u044f","zh-CN":"\u4e9a\u6d32"}},"country":{"geoname_id":1643084,"iso_code":"ID","names":{"de":"Indonesien","en":"Indonesia","es":"Indonesia","fr":"Indon\u00e9sie","ja":"\u30a4\u30f3\u30c9\u30cd\u30b7\u30a2\u5171\u548c\u56fd","pt-BR":"Indon\u00e9sia","ru":"\u0418\u043d\u0434\u043e\u043d\u0435\u0437\u0438\u044f","zh-CN":"\u5370\u5ea6\u5c3c\u897f\u4e9a"}},"location":{"accuracy_radius":1000,"latitude":-6.1749999999999998,"longitude":106.82859999999999,"time_zone":"Asia\/Jakarta"},"registered_country":{"geoname_id":1643084,"iso_code":"ID","names":{"de":"Indonesien","en":"Indonesia","es":"Indonesia","fr":"Indon\u00e9sie","ja":"\u30a4\u30f3\u30c9\u30cd\u30b7\u30a2\u5171\u548c\u56fd","pt-BR":"Indon\u00e9sia","ru":"\u0418\u043d\u0434\u043e\u043d\u0435\u0437\u0438\u044f","zh-CN":"\u5370\u5ea6\u5c3c\u897f\u4e9a"}}},"ip":"114.4.160.7"} window.jsData.paymentsMode = '0'; window.jsData.styleGuideUrl = 'https://styleguide.znanija.com/'; window.jsData.androidAppUrl = 'https://play.google.com/store/apps/details?id=co.brainly&hl=ru'; window.jsData.iOSAppUrl = 'https://apps.apple.com/ru/app/id745089947'; // brainly store items window.jsData.subjects = [{"id":59,"name":"\u0423\u0445\u043e\u0434 \u0437\u0430 \u0441\u043e\u0431\u043e\u0439","slug":"uhod_za_soboi","icon":"personal-care","bestInName":"\u0423\u0445\u043e\u0434\u0435 \u0437\u0430 \u0441\u043e\u0431\u043e\u0439","filterName":"\u0423\u0445\u043e\u0434 \u0437\u0430 \u0441\u043e\u0431\u043e\u0439","occupants":0,"rankable":"1","enabled":false,"sponsored":false},{"id":29,"name":"\u041c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a\u0430","slug":"matematika","icon":"mathematics","bestInName":"\u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a\u0435","filterName":"\u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":17,"name":"\u041b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0430","slug":"literatura","icon":"literature","bestInName":"\u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0435","filterName":"\u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":30,"name":"\u0410\u043b\u0433\u0435\u0431\u0440\u0430","slug":"algebra","icon":"algebra","bestInName":"\u0430\u043b\u0433\u0435\u0431\u0440\u0435","filterName":"\u0430\u043b\u0433\u0435\u0431\u0440\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":16,"name":"\u0420\u0443\u0441\u0441\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","slug":"russkii_yazyk","icon":"russian-alt","bestInName":"\u0440\u0443\u0441\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0440\u0443\u0441\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":31,"name":"\u0413\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u044f","slug":"geometriya","icon":"geometry","bestInName":"\u0433\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u0438","filterName":"\u0433\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":33,"name":"\u0410\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","slug":"angliiskii_yazyk","icon":"english","bestInName":"\u0430\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0430\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":10,"name":"\u0425\u0438\u043c\u0438\u044f","slug":"himiya","icon":"chemistry","bestInName":"\u0445\u0438\u043c\u0438\u0438","filterName":"\u0445\u0438\u043c\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":9,"name":"\u0424\u0438\u0437\u0438\u043a\u0430","slug":"fizika","icon":"physics","bestInName":"\u0444\u0438\u0437\u0438\u043a\u0435","filterName":"\u0444\u0438\u0437\u0438\u043a\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":3,"name":"\u0411\u0438\u043e\u043b\u043e\u0433\u0438\u044f","slug":"biologiya","icon":"biology","bestInName":"\u0431\u0438\u043e\u043b\u043e\u0433\u0438\u0438","filterName":"\u0431\u0438\u043e\u043b\u043e\u0433\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":42,"name":"\u0414\u0440\u0443\u0433\u0438\u0435 \u043f\u0440\u0435\u0434\u043c\u0435\u0442\u044b","slug":"drugie_predmety","icon":"others","bestInName":"\u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u0440\u0435\u0434\u043c\u0435\u0442\u0430\u0445","filterName":"\u0414\u0440\u0443\u0433\u0438\u0435 \u043f\u0440\u0435\u0434\u043c\u0435\u0442\u044b","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":13,"name":"\u0418\u0441\u0442\u043e\u0440\u0438\u044f","slug":"istoriya","icon":"history","bestInName":"\u0438\u0441\u0442\u043e\u0440\u0438\u0438","filterName":"\u0438\u0441\u0442\u043e\u0440\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":15,"name":"\u041e\u0431\u0449\u0435\u0441\u0442\u0432\u043e\u0437\u043d\u0430\u043d\u0438\u0435","slug":"obshtestvoznanie","icon":"social-science","bestInName":"\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e\u0437\u043d\u0430\u043d\u0438\u044e","filterName":"\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e\u0437\u043d\u0430\u043d\u0438\u044e","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":46,"name":"\u041e\u043a\u0440\u0443\u0436\u0430\u044e\u0449\u0438\u0439 \u043c\u0438\u0440","slug":"okruzhayushtii_mir","icon":"environment","bestInName":"\u043e\u043a\u0440\u0443\u0436\u0430\u044e\u0449\u0435\u043c \u043c\u0438\u0440\u0435","filterName":"\u041e\u043a\u0440\u0443\u0436\u0430\u044e\u0449\u0438\u0439 \u043c\u0438\u0440","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":8,"name":"\u0413\u0435\u043e\u0433\u0440\u0430\u0444\u0438\u044f","slug":"geografiya","icon":"geography","bestInName":"\u0433\u0435\u043e\u0433\u0440\u0430\u0444\u0438\u0438","filterName":"\u0433\u0435\u043e\u0433\u0440\u0430\u0444\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":37,"name":"\u0423\u043a\u0440\u0430\u0457\u043d\u0441\u044c\u043a\u0430 \u043c\u043e\u0432\u0430","slug":"ukrainsyka_mova","icon":"ukrainian-alt","bestInName":"\u0443\u043a\u0440\u0430\u0438\u043d\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0443\u043a\u0440\u0430\u0438\u043d\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":32,"name":"\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0442\u0438\u043a\u0430","slug":"informatika","icon":"informatics","bestInName":"\u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0442\u0438\u043a\u0435","filterName":"\u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0442\u0438\u043a\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":41,"name":"\u0423\u043a\u0440\u0430\u0457\u043d\u0441\u044c\u043a\u0430 \u043b\u0456\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0430","slug":"ukrainsyka_l_teratura","icon":"ukrainian-literature","bestInName":"\u0443\u043a\u0440\u0430\u0438\u043d\u0441\u043a\u043e\u0439 \u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0435","filterName":"\u0443\u043a\u0440\u0430\u0438\u043d\u0441\u043a\u043e\u0439 \u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":44,"name":"\u049a\u0430\u0437\u0430\u049b \u0442i\u043bi","slug":"kazak_tili","icon":"kazach-alt","bestInName":"\u043a\u0430\u0437\u0430\u0445\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u043a\u0430\u0437\u0430\u0445\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":22,"name":"\u042d\u043a\u043e\u043d\u043e\u043c\u0438\u043a\u0430","slug":"ekonomika","icon":"economics","bestInName":"\u044d\u043a\u043e\u043d\u043e\u043c\u0438\u043a\u0435","filterName":"\u044d\u043a\u043e\u043d\u043e\u043c\u0438\u043a\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":48,"name":"\u041c\u0443\u0437\u044b\u043a\u0430","slug":"muzyka","icon":"music","bestInName":"\u043c\u0443\u0437\u044b\u043a\u0435","filterName":"\u041c\u0443\u0437\u044b\u043a\u0430","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":25,"name":"\u041f\u0440\u0430\u0432\u043e","slug":"pravo","icon":"law","bestInName":"\u043f\u0440\u0430\u0432\u0435","filterName":"\u041f\u0440\u0430\u0432\u043e","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":49,"name":"\u0422\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f","slug":"tehnologiya","icon":"technology","bestInName":"\u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438","filterName":"\u0422\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f","occupants":0,"rankable":"1","enabled":false,"sponsored":false},{"id":43,"name":"\u0411\u0435\u043b\u0430\u0440\u0443\u0441\u043a\u0430\u044f \u043c\u043e\u0432\u0430","slug":"belaruskaya_mova","icon":"belarus-alt","bestInName":"\u0431\u0435\u043b\u043e\u0440\u0443\u0441\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0431\u0435\u043b\u043e\u0440\u0443\u0441\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":47,"name":"\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","slug":"francuzskii_yazyk","icon":"french","bestInName":"\u0444\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":45,"name":"\u041d\u0435\u043c\u0435\u0446\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","slug":"nemeckii_yazyk","icon":"german","bestInName":"\u043d\u0435\u043c\u0435\u0446\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u041d\u0435\u043c\u0435\u0446\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":50,"name":"\u0427\u0435\u0440\u0447\u0435\u043d\u0438\u0435","slug":"cherchenie","icon":"geometry","bestInName":"\u0447\u0435\u0440\u0447\u0435\u043d\u0438\u0438","filterName":"\u0427\u0435\u0440\u0447\u0435\u043d\u0438\u0435","occupants":0,"rankable":"1","enabled":false,"sponsored":false},{"id":51,"name":"\u041c\u0425\u041a","slug":"mhk","icon":"art","bestInName":"\u041c\u0425\u041a","filterName":"\u041c\u0425\u041a","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":52,"name":"\u041e\u0411\u0416","slug":"obzh","icon":"security","bestInName":"\u041e\u0411\u0416","filterName":"\u041e\u0411\u0416","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":53,"name":"\u041f\u0441\u0438\u0445\u043e\u043b\u043e\u0433\u0438\u044f","slug":"psihologiya","icon":"psychology","bestInName":"\u041f\u0441\u0438\u0445\u043e\u043b\u043e\u0433\u0438\u0438","filterName":"\u041f\u0441\u0438\u0445\u043e\u043b\u043e\u0433\u0438\u044f","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":54,"name":"\u041e\u02bbzbek tili","slug":"o_zbek_tili","icon":"uzbek","bestInName":"\u041e\u02bbzbek tili","filterName":"\u041e\u02bbzbek tili","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":55,"name":"\u041a\u044b\u0440\u0433\u044b\u0437 \u0442\u0438\u043b\u0438","slug":"kyrgyz_tili","icon":"kyrgyz","bestInName":"\u041a\u044b\u0440\u0433\u044b\u0437 \u0442\u0438\u043b\u0438","filterName":"\u041a\u044b\u0440\u0433\u044b\u0437 \u0442\u0438\u043b\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":56,"name":"\u0410\u0441\u0442\u0440\u043e\u043d\u043e\u043c\u0438\u044f","slug":"astronomiya","icon":"astronomy","bestInName":"\u0410\u0441\u0442\u0440\u043e\u043d\u043e\u043c\u0438\u0438","filterName":"\u0410\u0441\u0442\u0440\u043e\u043d\u043e\u043c\u0438\u044f","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":57,"name":"\u0424\u0438\u0437\u043a\u0443\u043b\u044c\u0442\u0443\u0440\u0430 \u0438 \u0441\u043f\u043e\u0440\u0442","slug":"fizkulytura_i_sport","icon":"physical-education","bestInName":"\u0424\u0438\u0437\u043a\u0443\u043b\u044c\u0442\u0443\u0440\u0435","filterName":"\u0424\u0438\u0437\u043a\u0443\u043b\u044c\u0442\u0443\u0440\u0430 \u0438 \u0441\u043f\u043e\u0440\u0442","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":58,"name":"\u0415\u0413\u042d \/ \u041e\u0413\u042d","slug":"ege_oge","icon":"egzam","bestInName":"\u0415\u0413\u042d \/ \u041e\u0413\u042d","filterName":"\u0415\u0413\u042d \/ \u041e\u0413\u042d","occupants":0,"rankable":"1","enabled":false,"sponsored":false}]; window.jsData.grades = [{"id":1,"name":"1 - 4 \u043a\u043b\u0430\u0441\u0441\u044b","slug":"1_4_klassy","icon":"lvl1","filterName":"1-4 \u043a\u043b\u0430\u0441\u0441\u044b"},{"id":2,"name":"5 - 9 \u043a\u043b\u0430\u0441\u0441\u044b","slug":"5_9_klassy","icon":"lvl2","filterName":"5-9 \u043a\u043b\u0430\u0441\u0441\u044b"},{"id":3,"name":"10 - 11 \u043a\u043b\u0430\u0441\u0441\u044b","slug":"10_11_klassy","icon":"lvl3","filterName":"10-11 \u043a\u043b\u0430\u0441\u0441\u044b"},{"id":4,"name":"\u0441\u0442\u0443\u0434\u0435\u043d\u0447\u0435\u0441\u043a\u0438\u0439","slug":"studencheskii","icon":"lvl4","filterName":"\u0441\u0442\u0443\u0434\u0435\u043d\u0447\u0435\u0441\u043a\u0438\u0439"}]; window.jsData.ranks = []; window.jsData.challenges = []; // end brainly store items window.jsData.htmlLang = 'ru'; window.jsData.brainlyPages = [{"name":"Brainly.pl","symbol":"PL","url":"https:\/\/brainly.pl","language":"Polski","region":"Polska","regionCode":"PL","code":"pl"},{"name":"Znanija.com","symbol":"RU","url":"https:\/\/znanija.com","language":"\u0420\u0443\u0441\u0441\u043a\u0438\u0439","region":"\u0420\u043e\u0441\u0441\u0438\u044f","regionCode":"RU","code":"ru"},{"name":"Brainly.lat","symbol":"ES","url":"https:\/\/brainly.lat","language":"Espa\u00f1ol","region":"Espa\u00f1a","regionCode":"ES","code":"es"},{"url":"https:\/\/brainly.lat","language":"Espa\u00f1ol","region":"Latinoam\u00e9rica","regionCode":"ES","code":"es"},{"name":"Brainly.com.br","symbol":"PT","url":"https:\/\/brainly.com.br","language":"Portugu\u00eas","region":"Brasil","regionCode":"BR","code":"pt"},{"name":"Nosdevoirs.fr","symbol":"FR","url":"https:\/\/nosdevoirs.fr","language":"Fran\u00e7ais","region":"France","regionCode":"FR","code":"fr"},{"name":"Eodev.com","symbol":"TR","url":"https:\/\/eodev.com","language":"T\u00fcrk\u00e7e","region":"T\u00fcrkiye","regionCode":"TR","code":"tr"},{"name":"Brainly.ro","symbol":"RO","url":"https:\/\/brainly.ro","language":"Rom\u00e2n\u0103","region":"Rom\u00e2nia","regionCode":"RO","code":"ro"},{"name":"Brainly.co.id","symbol":"ID","url":"https:\/\/brainly.co.id","language":"Bahasa Indonesia","region":"Indonesia","regionCode":"ID","code":"id"},{"name":"Brainly.in","symbol":"HI","url":"https:\/\/brainly.in","language":"English","region":"India","regionCode":"IN","code":"en-IN"},{"name":"Brainly.ph","symbol":"PH","url":"https:\/\/brainly.ph","language":"English","region":"Pilipinas","regionCode":"PH","code":"en-PH"},{"name":"Brainly.com","symbol":"US","url":"https:\/\/brainly.com","language":"English","region":"United States","regionCode":"US","code":"en-US"}] window.jsData.registerTosLinkInTextUrl = 'http://znanija.com/pages/politika_konfidentsialnosti'; window.jsData.hasPaymentsEnabled = true; window.jsData.paymentsConfig = { currency: '', faqPageUrl: 'https://faq-ru.brainly.com', contactEmail: '[e-mail]', }; window.jsData.paymentsByPayU = true; window.jsData.registrationParentRow = true; window.jsData.paymentsByPayUPublicKey = '7a985100-4936-430e-83cf-af6ea914af9b'; window.jsData.paymentsByPayUEnvName = 'live'; window.jsData.availableRatePlanIds = ["cmF0ZVBsYW46MGYxYjQ2OGItN2UyOC00NzZmLTkwMjYtZDQ5YThhZmYzYWEw","cmF0ZVBsYW46MmM0OTJjODEtYTJiMS00MzE3LTg4NDUtZTkwZjhhZDZjZjc4"] window.jsData.qpageNext = {"related_content_legacy":false}; window.jsData.achievementsFeatures = {"subject_name_alternation":true}; window.jsData.leaderboardFeatures = {"leaderboard_spotlight_notification":false,"leaderboard":false}; window.jsData.gtmContainerId = 'GTM-KN3M8C'; window.jsData.flexibleFunnelNameLog = 'F4'; window.jsData.flexibleFunnelNameUnlog = 'F4'; window.jsData.has3dsEnabled = true; window.jsData.hasAccountSettingsPageEnabled = true; window.jsData.hasDidomiCmpEnabled = true; window.jsData.branchIOTactics = {"simple_banner":false,"simple_banner_and_popover":false,"gray_blurred_v1":false,"gray_blurred_v2":false,"gray_blurred_v3":false,"gray_blurred_with_skip":false,"gray_blurred_all_with_skip":false,"gray_blurred_with_skip_and_hard_block":false,"red":false,"programmatic_simple_banner":false,"search_blurred":false,"homepage_ginny_one_third_banner":false}; window.jsData.web2AppSubjectInterstitials = {"math_full_screen":false,"english_full_screen":false,"math_half_screen":false,"english_half_screen":false,"ginny_half_screen":false}; window.jsData.branchIOBudgetLinks = {}; window.jsData.qpageBlockadeExceptions = []; window.jsData.tutoringFeatures = {"url_with_credentials":false,"history":false,"ask_question_flow":false,"answer_banner_entry":false,"chat_banner_entry":false,"verified_answer_box":false,"shared_question_editor":false,"tutoring_ep_answer_content":false,"chat_like_entry_onboarding":false,"web_to_app_banner":false,"tutoring_flow_modal":false,"task_force_banner_log":false,"task_force_banner_unlog":false,"task_force_banner_session_goals":false,"task_force_banner_session_goals_v2":false,"task_force_button_log":false,"task_force_button_unlog":false,"task_force_button_session_goals":false,"task_force_button_session_goals_v2":false,"task_force_card_log":false,"task_force_card_unlog":false,"task_force_card_session_goals":false,"session_counter_limitation":false,"new_ask_question_page":false,"native_in_answer_buttons":false,"tutor_ai":false,"upsell_toggle":false}; window.jsData.hasEmailRegistrationEnabled = true; window.jsData.croTactics = {"has_improved_brainly_plus_promos":false,"has_improved_payments_form":false,"has_mobile_app_landing_page":false,"has_monthly_plans_only":false}; window.jsData.hasSalesElementsHonorCodeLink = true; window.jsData.hasMonetizationLimitationsEnabled = true window.jsData.powerQuestionSupportingAnswerPlaceholders = 5 window.jsData.hasAnsweringFeedEnabled = true window.jsData.hasAwarenessModalEnabled = true window.jsData.amplitudeExperiments = {}; window.jsData.growthAnswerSemanticScoreConfig = {"threshold":50}; window.jsData.textbooksMeteringConfig = {"isEnabled":false,"cycleTime":null,"freePreviews":{"log":null,"unlog":null}}; window.jsData.topAnswerConfig = {"has_feature_enabled":false,"has_fixed_height_enabled":false}; window.jsData.studyPlannerFeatures = {"has_feature_enabled":false,"has_landing_page_enabled":false,"has_banner_on_feed_enabled":false,"has_navigation_link_enabled":false}; window.jsData.acceptHeader = "*\/*,text\/html,*\/*;q=0.9" window.jsData.chromeExtensionFeatures = {"has_notification_enabled":false,"has_landing_page_enabled":false,"has_navigation_link_enabled":false,"has_paid_landing_page_enabled":false}; window.jsData.hasSearchAskQuestionOnTopEnabled = true; })(); if(!document.getElementById('JwGbhcENqUNBgxIlSFGfwKAveMlONDUi')){ window.adBlockerDetected = true; } function isGTMScriptRequestBlocked(callback) { fetch('//www.googletagmanager.com/gtm.js?id=GTM-KN3M8C', { method: 'HEAD', mode: 'no-cors', }).then(function (response) { callback(response.redirected) }).catch(function () { callback(true) }); } if (!window.adBlockerDetected) { try { isGTMScriptRequestBlocked(function (adBlockerDetected) { if (adBlockerDetected) { window.adBlockerDetected = true } }); } catch(e) {} }

Answer 1

Давайте рассмотрим ваши задачи по порядку:

1. Решение системы уравнений: ${x - 2y = 4}$ ${7x - 2y = 8}$

   Метод сложения: Умножим первое уравнение на 7 и вычитаем второе уравнение: $7(x - 2y) - (7x - 2y) = 28 - 8$ $7x - 14y - 7x + 2y = 20$ $-12y = 20$ $y = -\frac{20}{12} = -\frac{5}{3}$

   Теперь, подставим значение $y$ в первое уравнение: ${x - 2 \cdot \left(-\frac{5}{3}\right) = 4}$ $x + \frac{10}{3} = 4$ $x = 4 - \frac{10}{3} = \frac{2}{3}$

   Ответ: $x = \frac{2}{3}$, $y = -\frac{5}{3}$

2. Решение системы методом сложения: ${4x + 2y = 24}$ ${7x - 2y = 31}$

   Сначала сложим оба уравнения: $(4x + 2y) + (7x - 2y) = 24 + 31$ $11x = 55$ $x = \frac{55}{11} = 5$

   Теперь, подставим значение $x$ в первое уравнение: ${4 \cdot 5 + 2y = 24}$ $20 + 2y = 24$ $2y = 24 - 20$ $2y = 4$ $y = \frac{4}{2} = 2$

   Ответ: $x = 5$, $y = 2$

3. Задача о легковых и грузовых автомобилях:

   Пусть $x$ - количество легковых автомобилей, $y$ - количество грузовых автомобилей. Согласно условию, у нас есть следующая система уравнений:

   $-x + 8 + y = 0$ (у нас 8 грузовых автомобилей больше, чем легковых) $x + 4y = 10$

   Теперь решим эту систему методом сложения. Сначала приведем первое уравнение к виду $x$:

   $-x + 8 + y = 0$ $x = 8 - y$

   Теперь подставим это выражение во второе уравнение:

   $(8 - y) + 4y = 10$

   $8 - y + 4y = 10$

   $8 + 3y = 10$

   $3y = 10 - 8$

   $3y = 2$

   $y = \frac{2}{3}$

   Теперь найдем $x$, используя первое уравнение:

   $x = 8 - \frac{2}{3} = \frac{22}{3}$

   Ответ: $x = \frac{22}{3}$, $y = \frac{2}{3}$

4. Система уравнений: $-x + 2y = 8$ $x + 4y = 10$

   Эта система имеет бесконечно много решений, так как второе уравнение можно получить, просто умножив первое уравнение на -1.

   Если вы хотите конкретное числовое решение, то добавьте дополнительное условие или ограничение.