Jawabanmu

2014-07-18T23:37:11+07:00
Kx-2y = 12 ... (i)
y = 2x-10 ...(ii)*nah m₂=2

Pers. i
kx-2y = 12
2y = kx-12
y = kx/2-6 *nah m₁ = k/2

Kalau tegak lurus, rumusnya
m₁.m₂ = -1
k/2 . 2 = -1
k = -1

^_^
2014-07-18T23:41:14+07:00
Jika kedua garis tegak lurus,syartnya m1.m2 = -1

dimana kx-2y = 12
            -2y = -kx +12
               y = k/2 x -6
dan y = 2x-10,dengan m2 = 2

maka m1..?

m1.m2 = -1
k/2 . 2 = -1
k/2 = -1/2
k = -1

smoga membantu