Answer :
Given A(8, 1), B(k, -4) and C(2, -5) are collinear
To Find: Find the value of k
So, The given points are collinear, if are (∆ABC)=0
= Area of triangle = 
Then, 
= 8(1)+k(-6)+2(3) = 0
= 8 - 6k + 6 = 0
= -6k = -14
Hence, K = 
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