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(y - 4) / (3 - 4) = (x - 2a) / (-a - 2a)
(y - 4) / (-1) = (x - 2a) / (- 3a)
(-3a) (y - 4) = (-1) (x - 2a)
-3ay + 12a = - x + 2a
- 3ay = - x + 2a - 12a
- 3ay = - x - 10a
y = 3ax + 10/3
m = ⅓ = 3a
a = ⅓ ÷ 3
a = ⅓ × ⅓ = 1/9
b) syarat tegak lurus :
m1 . m2 = - 1
- 3 . m2 = - 1
m2 = ⅓