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4x-2y=-6
y=-5x+10
4x-2y =-6
4x-2(-5x+10) =-6
4x+10x+10 =-6
4x+10x =-6-10
14x =-16
x =-16-14
x =-30
5x+y =10
5(-30)+y=10
-150 +y=10
y=10+150
y=160
x=-30,y=160
2. y=2x/2x-y=0
x+3y=-21
- y=2x
y=2x
x+3y=21
x+3(2x)=-21
x+6x =-21
7x =-21
x=-21-7
x=-28
y=2x
y=2(-28)
y=-56