Question

Diketahui garis 3x + 2y + 5 = 0 tegak lurus dengan garis px - 6y + 9 = 0. nilai p =

Answer 1

3x + 2y + 5 = 0
m1 = - 3/2

m1 x m2 = -1
m2 = 2/3

px - 6y + 9 = 0

m2 = -p / -6
2/3 = p/6
3p = 12
p = 4

Answer 2

3x + 2y +5 = 0 -> m = -3/2
m1 x m2 = -1 -> m2 = 2/3
px - 6y +9 = 0
-p : (-6) = 2/3 -> p : 6 = 2/3
p = 2/3 x 6 = 2 x 2
   = 4
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