Find the point equidistant from the points P(1, 3) and Q(-5, -5), and which lies on the line y= -1.

(-2, -2)

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(-2, -1)

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(-4, -1)

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(3, -1)

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Solution

The correct option is B (-2, -1)
Let the point be A. Since it lies on y = -1, its y coordinate will be -1. Thus, the coordinates of point A will be (x, -1).

$Distance AP = Distance AQ \Rightarrow {A P}^{2} = {A Q}^{2}$
$\Rightarrow (x - 1)^{2} + (- 1 - 3)^{2} = (x - (- 5))^{2} + (- 1 - (- 5))^{2} \Rightarrow (x - 1)^{2} + 16 = (x + 5)^{2} + 16 \Rightarrow x^{2} - 2 x + 1 + 16 = x^{2} + 10 x + 25 + 16 \Rightarrow - 2 x + 17 = 10 x + 41 \Rightarrow x = - 2$

Thus, the coordinates of point A will be (-2, -1).

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