Question

Решить систему
2(х+у)=8
3х+у=0

Answer 1

y=3x
2x-2*3x=8
2x-6x=8
-4x=8
x=-2
y=3*(-2)=-6

Answer 2

2(х-3х)=8
у=-3х

2х-6х=8
у=-3х

-4х=8
у=-3х

х=-2
у=6