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If one of the pair of lines ax^2+2hxy+by...

If one of the pair of lines `ax^2+2hxy+by^2=0` bisects the angle between positive directions of the axes, a, b, h satisfy the relation

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The correct Answer is:
`a+b=-2h`
The bisector of the angle between the positive directions of the axes is `y=x`.
Since it is one of the given pair of lines
`ax^(2)+2hxy+by^(2)=0`,we have
`x^(2)(a+2h+b)=0ora+b=-2h`.
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