Question

Решите систему:
2х+y=7
|x-y|=2

Answer 1

2x+y=7 = x=2-y
/x-y/=2 = 2 (2+y)+y=7

2 (2-y)+y=7
4-2y+y=7
-y=7-4
-y=3
y=3
x=2-(-3)=-5