Q19 of 112 Page 168

If the points (2, 5), (4, 6) and (a, a) are collinear, then the value of a is equal to

Here we have the points (2, 5), (4, 6) and (a, a) collinear.


∴ Area of triangle formed by these vertices is 0.
Let us say that the vertices are A(2,5),B(4,6) and C(a,a).



⇒


⇒


⇒


⇒


⇒ –8 + a = 0


⇒ a = 8

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