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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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