13. Let $P Q R$ be a right angled isosceles triangle, right angled at $P ( 2,1 )$. If the equation of the line $Q R$ is $2 x + y = 3$, then the equation representing the pair of lines $P Q$ and $P R$ is :\\
(A) $3 x 2 - 3 y 2 + 8 x y + 20 x + 10 y + 25 = 0$\\
(B) $3 x 2 - 3 y 2 + 8 x y - 20 x - 10 y + 25 = 0$
\section*{... Powered By IITians}
(C) $3 x 2 - 3 y 2 + 8 x y + 10 x + 15 y + 20 = 0$\\
(D) $3 x 2 - 3 y 2 - 8 x y - 10 x - 15 y - 20 = 0$\\