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2x-y-1=0
x+2y-8=0
2x+-y+-1=0
x+2y+-8=0
x=-2y+-8
2x+-y+-1=0
2x+-y+-1=0
2*(-2y+-8)+-y+-1=0
-4y+-16+-y+-1=0
-5y+-17=0
-5y=17/:-5
y=3,4
x=-2y+-8
x=-2*3,4+-8
x=-6,8+-8
x=-14.8
2x-y-1=0
x+2y-8=0
2x-y-1=0
x=8-2y
x=8-2y
16-4y-y-1=0
x=8-2y
-5y=-15 //:(-5)
x=8-2y
y=3
x=2
y=3