Question

The points (5,2,4),(6,-1,2) and (8,-7,K) are collinear if K is equal to

• A. -2
• B. 2
• C. 3
• D. -1

Answer 1

The correct option is A

-2

$D{R}^{1}S$ of A B = (1,-3,-2)

$D{r}^{1}S$ of BC = (2, -6, k-2) $\Rightarrow$ k = -2