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Question

For a circle x2+y2=81, what is the equation of chord whose mid point is (–2,3)

A
2x3y13=0
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B
2x+3y+13=0
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C
2x3y+13=0
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D
3x2y+13=0
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Solution

The correct option is C 2x3y+13=0

Slope of OP is
=32
Slope of the chord will be,
m=23
Equation of the chord will be,
y=2x3+c
Putting (2,3)
3=43+cc=133

Hence the equation will be,
3y=2x+13

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