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If the points $A (- 2, - 5), B (2, - 2)$ and $C (8, a)$ are collinear. then $a =$

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Correct option is B

Since A,B,C are collinear points.∴ Slope of AB=Slope of AC⇒34=a+510⇒a=52

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If the points A(−2,−5),B(2,−2) and C(8,a) are collinear. then a =

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If the points $A (- 2, - 5), B (2, - 2)$ and $C (8, a)$ are collinear. then $a =$