Sagot :
2x-y=4
-(3x-y=2)
2x-y=4
-3x+y=-2
Add all
-x=2
x=-2
Substitute:
2x-y=4
2(-2)-y=4
-4-y=4
-y=8
y=-8
-(3x-y=2)
2x-y=4
-3x+y=-2
Add all
-x=2
x=-2
Substitute:
2x-y=4
2(-2)-y=4
-4-y=4
-y=8
y=-8