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y-y1 = m (x-x1)
y-2 = -1 1/2 (x-1)
y-2 = -3/2 (x-1)
y-2 = -3/2x + 3/2 , supaya tidak pakai per lagi, maka kita kalikan 2 pada kedua ruas.
2(y-2) = -3x+3
2y-4 = -3x+3
3x+2y-4-3 = 0
3x+2y-7 = 0