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3x-y=2 (1,1) (2,4)
2*(x-y)-5=-1 (1,-1) (2,0)
3x-y=2
3*1-y=2
-y=2-3
y=1
3*2-y=2
6-y=2
-y=2-6
y=4
2*(x-y)-5=-1
2(1-y)-5=-1
2-2y-5=-1
-2y=-1+5-2
-2y=2
y=-1
2*(2-y)-5=-1
4-4y-5=-1
-4y=-1+5-4
y=0
x=0
y=-2
metoda przeciwnych współczynników;
3x-y=2
2*(x-y)-5=-1
3x-y=2 /*(-2)
2x-2y=4
-6x+2y=-4
2x-2y=4
-4x=0 /:(-4)
x=0
3*0-y=2
-y=2
y=-2
x=0
y=-2