1.

Find the value of `x`for which the points `(x-1), (2,1)a n d (4,5) `are collinear.

Answer» Let A(x,-1), B(2,1) and C(4,5) be the given collinear points.
Then, by collinearity of A,B,C we have: slope of AB=slope of BC
`(1-(-1))/(2-x)=((5-1))/((4-2)) Rightarrow (2)/(2-x)=2 Rightarrow 2-x=1 Rightarrow x=1`
Hence, x=1


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