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maka:
y - 4 = (1/2)(x - 2)
2y - 8 = x - 2
x - 2y + 6 = 0
y-4 = 1/2(x-2)
y-4 = 1/2 x - 1 kalikan 2 semua jadi 2y -8 = x - 2
2y-x-6 = 0 atau -x + 2y - 6 = 0