Question

помогите решить пожалуйста!!

Answer 1

9)
$frac{1}{5} (x + y) = 2 \ frac{1}{2} (x - y) = 1 \ \ x + y = 10 \ x - y = 2 \ \ 2x = 12 \ y = x - 2 \ \ x = 6 \ y = x - 2 \ \ x = 6 \ y = 4$
Ответ: (6; 4)

11)
$x + y = 1 - z \ x - y = 3 \ z = 2x \ \ z = 2x \ x + y = 1 - 2x \ x - y = 3 \ \ z = 2x \ 3x + y = 1 \ x - y = 3 \ \ z = 2x \ 4x = 4 \ y = x - 3 \ \ x = 1 \ y = x - 3 \ z = 2x \ \ x = 1 \ y = - 2 \ z = 2$
Ответ: (1; -2; 2)

Answer 2

https://znanija.com/task/29365942