JEE Main & Advanced Mathematics Pair of Straight Lines Question Bank Angle between the pair of straight lines, Condition for parallel and perpendicular lines

  • question_answer
    If in general quadratic equation \[f(x,y)=0,\Delta =0\] and  \[a+b=0\], then the equation represents

    A)            Two parallel straight lines

    B)            Two perpendicular straight lines

    C)            Two lines passing through origin

    D)            None of these

    Correct Answer: B

    Solution :

               It is obvious.


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