1.

If the point P(x, y) is equidistant from the points A(5, 1) and B (1, 5), prove that x = y.

Answer»

Coordinates are P(x, y), A(5, 1) and B (1, 5) 

Using distance formula = \(\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}\)

⇒ PA = PB

\(\sqrt{(x - 5)^2 + (y - 1)^2}\) = \(\sqrt{(x - 1)^2 + (y - 5)^2}\)

On squaring both sides, we get

(x -5)2 + (y - 1)2 = (x - 1)2 + (y - 5)2

x2 - 10x + 25 + y2 - 2y + 1 = x2 - 2x + 1 + y2 - 10y + 25

- 8x + 8y = 0

x = y proved



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