Question

(x + 1 = -y,
xy + 3x - 1 = 0;​

Answer 1

Ответ:

$\left \{ {{x=1} \atop {y=-2}} \right.$

Объяснение:

$\left \{ {{x+1=-y} \atop {xy+3x-1=0}} \right.\\\left \{ {-{x-1=y} \atop {-y^2-4y-4=0}} \right.\\\left \{ {{x+1=-y} \atop {y=-2}} \right.\\\left \{ {{x=1} \atop {y=-2}} \right.$