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Question

If P(x, y) is equidistant from the points A(2, 1) and B(-2, 4), the relation between x and y is .

A
8x - 6y + 15 = 0
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B
4x - 7y + 5 = 0
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C
x - 6y + 25 = 0
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Solution

The correct option is A 8x - 6y + 15 = 0
Given: P(x, y), A(2, 1), and B(-2, 4)

The distance between two points (x1,y1) and (x2,y2) is (x2x1)2+(y2y1)2.

P is equidistant from A and B, so PA = PB.

(x2)2+(y1)2=(x+2)2+(y4)2

(x2)2+(y1)2=(x+2)2+(y4)2

x24x+4+y22y+1=x2+4x+4+y28y+16

4x2y+5=4x8y+20

8x - 6y + 15 = 0

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