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Question

The equation of the line passing through the origin and having slopes 3 and 13 is

A
3y2+8xy3x2=0
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B
3x2+8xy3y2=0
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C
3y28xy+3x2=0
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D
3x2+8xy3y2=0
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Solution

The correct option is A 3y2+8xy3x2=0

General eqn. of line passing through origin having slope m,

y=mx

Eqn. of 1 st line having slope 3 is y=3x

y3x=0(1)


Eqn of line having slope 13 is,


=713=yx

3y=x(1)


3y+x=0(2)

On multiplying eqn. (1)&(2) we get,


(y3x)(3y+x)=0


3y2xy+9xy3x2=0

=3y2+8xy3x2=0

If is the required equation of lines.



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