Question

x-y = 10
2x+3y=0
Решите систему уравнений методом подстановки.

Answer 1

$left { {{x-y=10} atop {2x+3y=0}} right. \ left { {{x=10+y} atop {2(10+y)+3y=0}} right. \ left { {{x=10+y} atop {20+2y+3y=0}} right. \ left { {{x=10+y} atop {20+5y=0}} right. \ left { {{x=10+y} atop {y=-4}} right. \ left { {{x=10-4} atop {y=-4}} right. \ left { {{x=6} atop {y=-4}} right.$

Ответ: (6;-4)

Answer 2

Все понятно?