Question

If the points (x1, yı), (x2, y2) and (x1 + x2, y1 + y2) are collinear, then show that x1y2 = x2y1​

Answer 1

Answer:

Prove that (x1, y1), (x2, y2) , and (x3, y3) are collinear points if and only if

[x1 y1 1, x2 y2 1, x3 y3 1] = 0

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