Joint equation of the bisectors of the angles between the lines of a pair

1. A.
   $x^{2}-3xy+y^{2}=0$
2. B.
   $x^{2}+4xy-y^{2}=0$
3. C.
   $x^{2}-3xy-y^{2}=0$
4. D.
   $x^{2}+3xy-y^{2}=0$

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1. A.
   $\ 11x^{2} + 2xy - 11y^{2} = 0$
2. B.
   $\ x^{2} + 2xy - y^{2} = 0$
3. C.
   $\ 3x^{2} - 11xy + 2y^{2} = 0$
4. D.
   $\ 11x^{2} - 2xy - 11y^{2} = 0$

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1. A.
   $2p + q = 0$
2. B.
   $2p + 3q = 0$
3. C.
   $pq = 1$
4. D.
   $pq + 1 = 0$

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