1.

If the points A(1, 2), B(0, 0) and C(a, b) are collinear, then(a) a = b (b) a = 2b (c) a = – b (d) 2a = b

Answer»

(d) 2a = b

Points A(1, 2), B(0, 0) and C(a, b) are collinear if area of ΔABC = 0.

⇒ \(\frac{1}{2}\)[1(0 – b) + 0 (b – 2) + a (2 – 0)] = 0

⇒ –b + 2a = 0 ⇒ 2a = b.



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