Question

решите 2 вариант пожалуйста​

Answer 1

1)

$y = 5 - x \ 3x - y = 11 \ \ y = 5 - x \ 3x - (5 - x) = 11 \ \ 3x - (5 - x) = 11 \ 3x - 5 + x = 11 \ 4x = 11 + 5 \ 4x = 16 \ x = 16 div 4 \ x = 4 \ \ y = 5 - x = 5 - 4 = 1$

Ответ: (4;1)

2)

$x - 3y = 6\ 2y - 5x = - 4 \ \x = 3y + 6 \ 2y - 5(3y + 6) = - 4 \ \ 2y - 5(3y + 6) = - 4 \ 2y - 15y - 30 = - 4 \ - 13y = - 4 + 30 \ - 13y = 26 \ y = 26 div ( - 13) \ y = - 2 \ \ x = 3y + 6 = 3 times ( - 2) + 6 = - 6 + 6 = 0$

Ответ: (0;-2)