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JEE Main & Advanced Mathematics Straight Line Question Bank Concurrency of three lines

  • question_answer
    The lines \[15x-18y+1=0,\] \[12x+10y-3=0\] and \[6x+66y-11=0\] are                                [AMU 1978]

    A)            Parallel                                      

    B)            Perpendicular

    C)            Concurrent                                

    D)            None of these

    Correct Answer: C

    Solution :

               \[3\,(12x+10y-3)-2(15x-18y+1)\]\[=6x+66y-11=0\]                    Hence the lines are concurrent.


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