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BITSAT2013MathematicsStraight LinesActual

If the lines x + my + n =0, mx + ny + =0 and nx + y + m =0 are concurrent then

Options

  1. A+m+n=0
  2. B-m-n=0
  3. C+m-n=0
  4. Dm+n- =0

Correct answer

A. +m+n=0

Step-by-step solution

Since the lines are concurrent, so array l | array lll & m & n m & n & n & & m array |=0 3 mn - ³- m ³- n ³=0 ( + m + n ) ( ²+ m ²+ n ²-( m - mn - n )=0 . array + m + n =0 [ ²+ m ²+ n ²>6 ~m + mn + n ]

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