(adsbygoogle = window.adsbygoogle || []).push({}); Help neede in coordinate geometry!!!!

1. The problem statement, all variables and given/known data

here is the question :

If the pairs of lines [tex]x^2-2pxy-y^2[/tex] and [tex]x^2-2qxy-y^2[/tex] are such that each pair bisects the angle between the other pair , then pq equals ....??

the answer somehow is -1. i think it uses the concept of homogenisation (if u ppl know what it is . searched the net but found not a single page on it ) . if u know this concept plz explain it 2 me and how u come to this answer .

thanx in advance

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Help neede in coordinate geometry

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