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AP EAMCET2014MathematicsCircle

The condition for the lines l x+m y+n=0 and l₁ x+m₁ y+n₁=0 to be conjugate with respect to the circle x^2+y^2=r^2 , is

Options

  1. Ar^2 (I₁+m m₁ )=n n₁
  2. Br^2 (I₁-m m₁ )=n n₁
  3. Cr^2 (I₁+m m₁ )+n n₁=0
  4. Dr^2 (I m₁+I₁ m )=n n₁

Correct answer

A. r^2 (I₁+m m₁ )=n n₁

Step-by-step solution

Condition for conjugate line is r^2 (I₁+m m₁ )=n n₁

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