diketahui garis 3 x + 2y + 5 = 0 tegak lurus dengan garis p x kurang 6 y + 9 = 0 nilai P =

3x+2y+5=0 ...m = -3/2
tgk lurus
m = -1 / (-3/2)
= 2/3
px-6y+9=0 ... m= -p/-6 =p/6
2/3 = p/6
3p = 2.6
3p=12
p = 4

cra cpat..

garis 3x+2y tgk lurus dgn
-2x+3y
px-6y

-6y/3y = px/-2x
-2 = -p/2
p = -2 . -2
p = 4