Question

Прошу, помогите !!!
{X+2y=-8
{2x-y=9

Answer 1

$\left \{ {{x+2y=-8} \atop {2x-y=9}} \right. \left \{ {{x=-8-2y} \atop {2(-8-2y)-y=9}} \right. \\ -16-4y-y=9 \\ -5y=9+16 \\ -5y=25 \\ y=-5 \\ x=-8-2y=-8-2*(-5)=-8+10=2$
                   Ответ (2; -5)

Answer 2

Ответ: х=2, у=-5.
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