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Question

The perpendicular bisector of the line segment joining the points A(1,5) and B(4,6) cuts the y-axis at

A
(0,13)
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B
(0,14)
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C
(0,12)
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D
(13,0)
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Solution

The correct option is A (0,13)
The given points are A(x1,y1)=(1,5) and B(x2,y2)=(4,6).
The perpendicular bisector of AB will pass through the midpoint of AB.
Now the perpendicular bisector of AB will meet Y axis at P(0,y).
AP=BP
Applying distance formula, we get
AP2=BP2
(x10)2+(y1y)2=(x20)2+(x2y)2
(10)2+(5y)2=(40)2+(6y)2
After solving, we get y=13
Therefore, the point is (0,13).

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