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y2 - y1
m = ----------
x2 - x1
gradien titip P-Q ( -4 , 3) ( -2 , -2)
x1 y1 x2 y2
-2 - 3 - 5
m1 = ----------- = ------
-2 - ( -4 2
syarat garis saling tegak lurus m1 x m2 = -1
maka
m1 x m2 = -1
- 5/2 x m2 = -1
m2 = 2/5