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If the distance of P(x, y) from A(5, 1) and B(-1, 5) are equal then prove that 3x = 2y. |
Answer» Point P(x, y) is equidistant from the points A(5, 1) and B(– 1, 5), means PA = PB or PA2 = PB2 (5 – x)2 + (1 – y)2 = (– 1 – x)2 + (5 – y)2 (25 + x2 – 10x) + (1 + y2 – 2y) = (1 + x2 + 2x + 25 + y2 – 10y) 26 + x2 – 10x + y2 – 2y = (26 + x2 + 2x + y2 – 10y) 12x = 8y 3x = 2y Hence proved. |
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