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y = x
x-y = 0
maka a = 1, b = -1 dan c = 0
atau -x+y = 0
maka a = -1, b = 1 dan c = 0
y = x+1
x-y = -1
maka a = 1, b = -1, dan c = -1
-x+y = 1
maka a = -1, b = 1 dan c = 1
grafik, lihat lampiran!