Question

помогите умоляю!!!!
2x+y=-1
x+2y=4

Answer 1

2x+y=-1  2х+у=-1
x+2y=4   х=4-2у
2(4-2у)+у=-1
8-4у+у=-1
-3у=-1-8
-3у=-9
у=-9/(-3)
у=3
х=4-2*3
х=4-6
х=-2