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2x-y=1
x=-2-2y
2(-2-2y)-y=1
x=-2-2y
-4-4y-y=1
x=-2-2y
-5y=5
x=-2-2y
y=-1
x=-2-2(-1)
y=-1
x=-2+2
y=-1
x=0
b){x+4y=-2
3x-8y=10
x=-2-4y
3(-2-4y)-8y=10
x=-2-4y
-6-12y-8y=10
x=-2-4y
-20y=16
x=-2-4y
y=-4/5
x=-2-4(-4/5)
y=-4/5
x=-2+3i1/5
y=-4/5
x=1i1/5
c){x-2y=3
-2x+y=8
x-2y=3
y=8+2x
x-2(8+2x)=3
y=8+2x
x-16-4x=3
y=8+2x
-3x=19
y=8+2x
x=-19/3=-6i1/3
y=8+2(-6i1/3)
x=-6i1/3
y=8-12i2/3
x=-6i1/3
y=-4i2/3