Math Chapter Wise Conic Section English MCQ UP PCS (Pre) 1997 Q.The line lx+my=n touches the hyperbola 2 2 x y 1 a b + = + = if: Aal+bm=n Ba2 l2 +b2 m2 =n2 Cal–bm=n Da2 l2 –b2 m2 =n2 Show answer Correct answer: a2 l2 –b2 m2 =n2