Question

Решить систему уравнений:
2y-x=8
3x+y=-10

Answer 1

$left { {{2y-x=8} atop {3x+y=-10}} right. left { {{x=-8+2y} atop {3x+y=-10}} right. \ \3(-8+2y)+y=-10 \-24+6y+y=-10 \-24+7y=-10 \7y=-10+24 \7y=14 \y=2\ \x=-8+2*2 \x=-8+4 \x=-4 \(x,y)=(-4,2)$