Q13 of 85 Page 211

If three points (h, 0), (a, b) and (0, k) lie on a line, show that

If the points A (h, 0), B (a, b) and C (0, k) lie on a line


Slope of AB = Slope of BC



⇒ - ab = (k-b) (a-h)


⇒ - ab = ka- kh –ab +bh


⇒ ka +bh = kh


Dividing both the sides by kh


⇒


⇒ Hence proved.


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