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Question

Find the equation to the locus of a point which is always equidistant from the points whose coordinates are (2,3) and (4,5)

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Solution

Let the point be P(h,k)
A(2,3) and B(4,5)
PA=(h2)2+(k3)2PB=(h4)2+(k+5)2
Given PA=PB
(h2)2+(k3)2=(h4)2+(k5)2h2+44h+k2+96h=h2+168h+k2+2510k4h+4k=28h+k=7
Replacing h by x and k by y
x+y=7

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