A) \[-\frac{5}{2}\]
B) \[\frac{5}{2}\]
C) \[\frac{3}{2}\]
D) \[\frac{1}{2}\]
Correct Answer: B
Solution :
Let A be (- 2, - 5), B (2, -2) and C is (8, a), we know that, three points are collinear if slope of AB = slope of BC \[\Rightarrow \,\,\frac{-2+5}{2+2}=\frac{a+2}{8-2}\,\Rightarrow \,\,a=\frac{5}{2}\].
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