Question

Помогите решить систему способом сложения: {2х-у=-5 {х-3у=-6 (ответ возможно должен получиться (-1,8 ; 1,4), но не точно). Посмотреть ответы kzdurak9 kzdurak9 Ответ: 2x + у = -5; x - 3y = -6, 2x + y = -5; -2x + 6y = 12. x = 3y - 6 y + 6y = 12 - 5 7y = 7; y = 1. x = 3 * 1 - 6 = 3 - 6 = -3; y = 1. Ответ: (-3; 1). Объяснение: вот ответ Пеппер Пеппер Ответ: (-1,8;  1,4) Объяснение: {2х-у=-5 {х-3у=-6 (умножим на -2) 2х-у=-5 -2х+6у=12      5у = 7;                 у=1,4 2х-1,4=-5;  2х=-3,6;  х=-1,8 Новые вопросы в Алгебра Упростите выражение: (a^3)^8а^3/a^20 Вычислите: 2¾+24 Срочноо Освободитесь от иррациональности в знаменателе дроби: 2/√2 8. Сума двох чисел дорівнює 110. Якщо одне число збільшити на 30%, а друге - на 80%, то їхня різниця дорівнюватиме 19. Знайдіть ці числа. 221 Розкладіть на множники вираз: 1) 2) 16y ^ 2 - 36/49 * a ^ 2; 4/9 * b ^ 2 - 25/64 * a ^ 2 3) 4) 2 1/4 * p ^ 2 - 9/100 * q ^ 2; 1 7/9 * m ^ 2 - 49/8 … 1 * n ^ 2 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

Для решения системы уравнений методом сложения, нужно сложить два уравнения так, чтобы одна из переменных ушла, и осталось только уравнение с другой переменной.

В данном случае у нас есть система уравнений:

1. 2x - y = -5
2. x - 3y = -6

Мы можем умножить второе уравнение на 2, чтобы получить уравнение с x с коэффициентом 2 и вычесть его из первого уравнения:

2 * (x - 3y) = 2 * (-6) 2x - 6y = -12

Теперь сложим это уравнение с первым уравнением:

(2x - y) + (2x - 6y) = -5 + (-12) 4x - 7y = -17

Таким образом, мы получили новое уравнение: 4x - 7y = -17.

Теперь у нас есть система из двух уравнений:

1. 4x - 7y = -17
2. x - 3y = -6

Мы можем решить эту систему методом сложения, применяя аналогичные шаги:

Умножим второе уравнение на 4: 4 * (x - 3y) = 4 * (-6) 4x - 12y = -24

Сложим это уравнение с первым уравнением: (4x - 7y) + (4x - 12y) = -17 + (-24) 8x - 19y = -41

Теперь у нас есть новое уравнение: 8x - 19y = -41.

Мы получили систему из двух уравнений:

1. 4x - 7y = -17
2. 8x - 19y = -41

Решим эту систему уравнений с помощью метода сложения:

Умножим первое уравнение на 8 и второе уравнение на 4:

8 * (4x - 7y) = 8 * (-17) 32x - 56y = -136

4 * (8x - 19y) = 4 * (-41) 32x - 76y = -164

Теперь сложим эти уравнения:

(32x - 56y) + (32x - 76y) = -136 + (-164) 64x - 132y = -300

Мы получили новое уравнение: 64x - 132y = -300.

Однако, в результате сложения уравнений, мы не получили исходную систему с уравнениями (2x - у = -5) и (x - 3у = -6). Возможно, в процессе вычислений произошла ошибка. Пожалуйста, проверьте правильность уравнений и коэффи