Question

Решите систему уравнений 2x+y=1 3x+2y=0

Answer 1

у=1-2х
3х+2(1-2х)=0

3х+2-4х=0
-х=-2
х=2
у=-3

Answer 2

2х+у=1|×(-2)
3х+2у=0

-4х-2у=-2
3х+2у=0

-х=-2
х=2
3×2+2у=0
2у=-6
у=-3