Prove that the points (a, b), (a\ast, b\ast) and (a - a\ast, b - b\ast) are collinear, if ab\ast = ab.

Prove that the points (a, b), (a\ast, b\ast) and (a - a\ast, b - b\ast

1.	Prove that the points (a, b), (a\ast, b\ast) and (a - a\ast, b - b\ast) are collinear, if ab\ast = ab.
Answer» Prove that the points (a, b), (a\ast, b\ast) and (a - a\ast, b - b\ast) are collinear, if ab\ast = ab.