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1. -x-3y=5
y=-2x
-x-3(-2x)=5
y=-2x
-x+6x=5
y=-2x
5x=5
y=-2x
x=1
y=-2 *1
x=1
y=-2
2.
3x+y =10
y=2x
3x+2x=10
y=2x
x=2
y=4
3.
4x-y=6
y=x
4x-x=6
y=x
3x=6
y=x
x=2
y=2
-x-3y=5
y=-2x
-x-3(-2x)=5
-x+6x=5
5x=5
x=1
y=-2*1
y=-2
2.
3x+y=10
y=2x
3x+2x=10
5x=10
x=2
y=2*2
y=4
3.
4x-y=6
y=x
4x-x=6
3x=6
x=2
y=2