Question

Реши систему уравнений методом подстановки:{x−2y=−167{x−12y=7 Смотреть ответ {x−2y=−167x−12y=7 В первом уравнении выразим x через y. Выпишем из системы второе уравнение и подставим вместо x полученное значение. {x=2y−167x−12y=77⋅x−12y=7;7⋅(2y−16)−12y=7;14y¯¯¯¯¯−112−12y¯¯¯¯¯=7;2y=7+112;2y=119;y=1192;y=59,5.¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ Найдём x из первого уравнения: x=2⋅59,5−16;x=103.¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ Правильный ответ: (103;59,5) тут же не верно по условию IrkaShevko IrkaShevko Ответ: (-201,8; -17,4) Пошаговое объяснение: из первого: {x = -167 + 2y {x - 12y = 7 подставим во второе: {x = -167 + 2y {-167 + 2y - 12y = 7 {x = -167 + 2y {10y = -174 {x = -167 + 2y {y = -17,4 {x = -201,8 {y = -17,4 минус в условии не заметила сразу, уже исправила Новые вопросы в Математика 3. Экзаменационные билеты пронумерованы от 1 до 24. Найдите вероятность того, что номер случайно выбранного учеником билета является двузначным числом … . A) c) E) 2/3 24 2/3 13 24 15 12 24 B) D) 10 24 9 24​ Возьмём отрезок длиной 56 см и разделим на четыре на равные друг другу части, так что расстояние между серединами крайних частей будет равно 32 см. Ск … олько сантиметров расстояние между серединами средних частей. сумма двух последовательных чисел равна 85 найдитеэти числа 5. В первый день магазин продал 20% товара, во второй день 60% оставшегося товара. Сколько процентов товара продал магазин за два дня? ​ Зробити треба номер 1 і 2 з другого Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . Вы можете указать условия хранения и доступ к cookies в своем браузере. 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Answer 1

Давайте проверим ваше решение.

Исходная система уравнений:

{ x - 2y = -167 { x - 12y = 7

Шаг 1: В первом уравнении выразим x через y: x = 2y - 167

Шаг 2: Подставим это значение во второе уравнение: (2y - 167) - 12y = 7

Упростим: 2y - 167 - 12y = 7 -10y - 167 = 7 -10y = 7 + 167 -10y = 174 y = 174 / -10 y = -17.4

Шаг 3: Найдем x, подставив найденное значение y в выражение для x: x = 2(-17.4) - 167 x = -34.8 - 167 x = -201.8

Итак, получили x = -201.8 и y = -17.4.

Поэтому правильный ответ: (-201.8; -17.4).