JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2005

  • question_answer
        The differential equation of all non-vertical lines in a plane is:

    A)  \[\frac{{{d}^{2}}y}{d{{x}^{2}}}=0\]                         

    B)  \[\frac{{{d}^{2}}x}{d{{y}^{2}}}=0\]

    C)  \[\frac{dy}{dx}=0\]                       

    D)  \[\frac{dx}{dy}=0\]

    Correct Answer: A

    Solution :

                    The general equation of all non-vertical lines is a plane is\[ax+hy=1,\]where\[h\ne 0\] \[\Rightarrow \]               \[a+h\frac{dy}{dx}=0\] \[\Rightarrow \]               \[h\frac{{{d}^{2}}y}{d{{x}^{2}}}=0\] \[\Rightarrow \]               \[\frac{{{d}^{2}}y}{d{{x}^{2}}}=0\]


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