Question:
Mark the tick against the correct answer in the following:
If the points $A(3,-2), B(k, 2)$ and $C(8,8)$ are collinear then the value of $k$ is
A. 2
B. $-3$
C. 5
D. $-4$
Solution:
$\Rightarrow 10 k-50=0$
$\Rightarrow k=5$
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