Question

Задание по алгебре.....

Answer 1

Ответ:

а)

$y - x = - 1 \\ x + 3y = 9 \\ 4y = 8 \\ y= 2 \\ 2 = x - 1 \\ x = 3$

б)

$3x - 2y = 12 \\ x + 2y = - 4 \\ 4x = 8 \\ x = 2 \\ y = - 1$

в)

$x + y = - 5 \\ 3x - y = - 7 \\ 4x = - 12 \\ x = - 3 \\ y = - 2$