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What is a if points (1,3),(2,1),(a,a-4) coliniars ?

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What is a if points (1,3),(2,1),(a,a-4) coliniars ?

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A(1,3) ,B(2,1) and C(a,a-4)

If A,B and C are colinear then area of triangle formed by ABC s zero.

`arDelta ABC=(1/2)|[1,3,1],[2,1,1],[a,a-4,1]|=0`







Thus A(1,3),B(2,1) and C(3,-1) are colinear

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