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