Jika titik A(6,4,-2) B(4,3,x) dan C(0,1,10) segaris, nilai x =...

AB
= B - A
= (-2, -1, x+2)

BC
= C - B
= (-4, -2, 10-x)

segaris, maka
AB = k. BC
(-2, -1, x+2) = k.(-4, -2, 10-x)

-4k = -2
k = 1/2

maka nilai x
(10-x)1/2 = x + 2
10-x = 2x + 4
3x = 6
x = 2