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Реши систему уравнений: {y+x=10 x−y=19 Смотреть ответ wieslawlozickip5w1nd wieslawlozickip5w1nd Ответ: Объяснение: {y+x=10 {x-y=19 {y+x=10 {x=y+19    (заменить (1) уравнение Y+(x+19)=10 2y=-9 Y=-4,5   (заменить (2) уравнение x-(-4,5)=19 x+4,5=19 x=19-4,5 x=14,5 OTBET: {x=14,5   ; {y=-4,5 Новые вопросы в Алгебра Сравните числа 8,3×10⁷ и 3,8×10⁷ ЛЮДИ ПОМОГИТЕ ПЛИЗ (05.10.2023) АЛГЕБРА (все задачи пронумерованы, их 5)1. В городе N живет 500000 жителей. Среди них 30% детей и подростков. Среди вз … рослых 80% работают. Сколько взрослых жителей не работает? (пенсионеры, студенты, домохозяйки и т.п.). 2. Смешали некоторое количество 11% раствора некоторого вещества с таким же количеством 15% раствора этого вещества. Сколько процентов составляет концентрация получившегося раствора? 3. Имеется два сплава. Первый содержит 5% меди, а второй - 11% меди. Масса второго сплава больше массы первого на 8 кг. Из двух сплавов получили третий сплав, содержащий 10% меди. Найти массу третьего сплава. 4. Изюм получается в процессе сушки винограда. Сколько кг винограда потребуется для получения 54 кг изюма, если виноград содержит 90% воды, а изюм содержит 5% воды? 5. Береза к началу лета была на 10% ниже ели. За лето береза выросла На 21%, а ель на 10%. Какое дерево теперь ниже и на сколько процентов?​ d⁴*d⁴ (z+y)¹⁵:(z+y)⁹ C⁷:c (m-3)³ (m-3)⁸ n⁷:n6 (3x - 1)(3x+1)-(x+7) Скоротіть вираз Додайте почлено нерівності m> 7 1/5 i n > 5/6 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 рассмотрим решение системы уравнений:

1. y + x = 10
2. x - y = 19

Мы можем решить эту систему методом сложения или вычитания. Для начала, давайте сложим оба уравнения:

(y + x) + (x - y) = 10 + 19

Упростим:

y + x + x - y = 29

Теперь, объединим подобные слагаемые:

y - y + x + x = 29

y - y отменяется:

2x = 29

Теперь разделим обе стороны на 2, чтобы найти значение x:

2x / 2 = 29 / 2

x = 29 / 2

x = 14.5

Теперь, когда у нас есть значение x, мы можем найти значение y, используя любое из исходных уравнений. Давайте воспользуемся первым уравнением:

y + x = 10

Подставляем значение x:

y + 14.5 = 10

Выразим y:

y = 10 - 14.5

y = -4.5

Итак, решение системы уравнений:

x = 14.5 y = -4.5