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Ответ

Автор - aliyas1

1) используем метод сложения:

2y = 12 \ y = 6 \ x = 10 - y \ x = 10 - 6 \ x = 4

Ответ: (4; 6)

2) Умножим первое уравнение на 2 и складываем со вторым:

6x + 2y =   4 \  - 6x - 2y =  - 4 \ 0 = 0

Ответ: нет решения

3)

Умножим первое уравнение на 2 и складываем со вторым:

2x + 2y = 6 \ y - 2x =  - 3 \ 3y = 3 \ y = 1 \ x = 3 - y \ x = 2

Ответ: (2; 1)

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