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Przykład:
3x + 4y + 5 = 0
1.
x=4, to
3*4+4y+5=0
12+4y+5=0
4y+17=0
4y=-17
y=-17/4
y=-4¼
x=4. y=-4¼
2.
dla y=2 mamy:
3x+4*2+5=0
3x+8+5=0
3x+13=0
3x=-13
x=-13/3
x=-4⅓
y=2, x=-4⅓
x=(-3)
y=1
3*(-7)+4*6,5+5=0
x=(-7)
y+4,6
x=-3
y=1
x=-5
y=2,5