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Question

The locus of the point of intersecion of the lines 3xy43γ=0 and 3γ x+γ y43=0 is a hyperbola of eccentricity


A

1

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B

2

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C

3

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D

4

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Solution

The correct option is B

2


The equation of lines 3xy43γ=0 and 3γ x+γ y43=0 can be rewritten as3xy=43γ and 3γx+γy=43 respectively.

Multiplying the equations:

3γx2γy2=48γ

3γx248γγy248γ=1 x216y248=1

This is the standard equation of a hyperbola where a2=16 and b2=48.

Eccebtricity,e=a2+b2a2

e=16+4816 e=84 e=2


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