1. mk=ml
2. mk.ml= -1
3. y-y1=m(x-x1)
4. y-y1 = x-x1
y2-y1 x2-x1
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1. mk=ml
2. mk.ml= -1
3. y-y1=m(x-x1)
4. y-y1 = x-x1
y2-y1 x2-x1
----- = ------
y2-y1 x2-x1
atau
x y
-- + --- = 1
x1 y2