Q. For what value of k, the points (k, - 2), (1, 4), (- 3, 16) in given order are collinear?

Take points (k,2) and (1,4).
As they are co-linear, 
When x=k, y=2. When x=1, y=4.
That is, k:2:: 1:4
= 4k=2
Therefore k = 2/4 = 1/2
​Hope this helps :)
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Sorry.. I meant -2.
The answer will be -1/2.
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Hope u got it

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K=3

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