Answer :

Three points A, B, C are said to be collinear if,


Area of triangle formed by three points is zero


The formula of Area of Triangle of three points is given as follows:


Area, A = 0


= 0


1/2 × {[-3k + 21] – [-3 + k]} = 0


-4k + 21 + 3 = 0


4k = 24


k = 6


Therefore the value of k is 6.

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