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4-3/-1-2
hasilnya -1/3
y-y1 = y2-y1
x-x1 = x2-x1
y-3 = 4-3
x-2 = -1-2
y-3 = 1
x-2 = -3
-3(y-3) = 1(x-2)
-3y+9 = x-2
-3y-x+9 = -2
-3y-x+9+2 = 0
-3y -x + 11 = 0