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Question

If the points (7,2),(5,1) and (3,k) are collinear, then find the value of k.

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Solution

Point A(7,2),B(5,1) and C(3,k) are collinear if

Slope of AB= Slope of BC
1(2)57=k135
32=k12
k1=3
k=3+1=4

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