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J & K CET Engineering J and K - CET Engineering Solved Paper-2010

  • question_answer
    The angle between the pair of straight lines represented by the equation \[12{{x}^{2}}+7xy-12{{y}^{2}}-x-7y-1=0\]is

    A)  \[\frac{\pi }{3}\]

    B)  \[\frac{\pi }{4}\]

    C)  \[\frac{\pi }{2}\]

    D)  \[\frac{\pi }{6}\]

    Correct Answer: C

    Solution :

    Given,  pair of straight lines is \[12{{x}^{2}}+7xy-12{{y}^{2}}-x-7y-1=0\] Here, \[a+b=12+(-12)=0\] Therefore, both lines are perpendicular.


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