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2x-3y=1
4x-4y+3x+3y=13
2x-3y=1
7x-y=13
2x-3y=1
-y=13-7x/:(-1)
2x-3y=1
y=-13+7x
2x-3(-13+7x)=1
y=-13+7x
2x+39-21x=1
y=-13+7x
-19x=38/:(-19)
y=-13+7x
x=-2
y=-13+7*(-2)
x=-2
y=-13-14
x=-2
y=-27
x=-2