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3x + y - 5 = 0
3x +y + 5 = 0
3x+y=5
3x+y=-5
y=5-3x
3x+5-3x=-5
0=-10
sprzeczność
b)
2x - 4y - 4 = 0
2x - 4y - 8 = 0
2x-4y=4|:2
2x-4y=8
x=2+2y
2(2+2y)-4y=8
4+4y-4y=8
0=4
sprzeczność