Q. 84.2( 99 Votes )
Find the value of x for which the points (x, – 1), (2, 1) and (4, 5) are collinear.
Answer :
If the points (x, – 1), (2, 1) and (4, 5) are collinear, then Slope of AB = Slope of BC
⇒ 
⇒ 
⇒ 2= 4 - 2x
⇒ x= 1
Thus, required value of x is 1.
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