Question

(x+2y=1
{-x + 2 y =-3​

Answer 1

Ответ:

$x = 1 - 2y \\ \\ - (1 - 2y) + 2y = 3 \\ - 1 + 2y + 2y = 3 \\ 4y = 4 \\ y = 1 \\ \\ x = 1 - 2y \\ x = 1 - 2 \times 1 \\ x = 1 - 2 \\ x = - 1 \\ \\ y = 1 \\ x = - 1$