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Find the equation of the locus of a point P(x,y) such tha...

Find the equation of the locus of a point P(x,y) such that PV = PW, where V = (1,1) and W = (3,5)

A.

2x + 2y = 9

B.

2x + 3y = 8

C.

2x + y = 9

D.

x + 2y = 8

Correct answer is D

The locus of a point P(x,y) such that PV = PW where V = (1,1) and W = (3,5). This means that the point P moves so that its distance from V and W are equidistance.

PV = PW

(x1)2+(y1)2=(x3)2+(y5)2.

Squaring both sides of the equation,

(x-1)2 + (y-1)2 = (x-3)2 + (y-5)2.

x2-2x+1+y2-2y+1 = x2-6x+9+y2-10y+25

Collecting like terms and solving, x + 2y = 8.