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Question

The Straight lines represented by the equation 135x2−136xy+33y2=0 are equally inclined to the line

A
x2y=7
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B
x+2y=7
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C
x2y=4
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D
3x+2y=4
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Solution

The correct option is B x+2y=7
Give pair of lines is 135x2136xy+33y2=0 ...(1)

The equation of bisector of angles between pair of lines (1) is

x2y2ab=xyhx2y213533=xy68

2x2+3xy2y2=0(x+2y)(2xy)=0

One of the bisectors is x+2y=0 which is parallel to the line x+2y=7.

Hence, the line x+2y=7 is equally inclined to the given lines.

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