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JEE Main & Advanced Mathematics Straight Line Question Bank Slope of line, Equation of line in different forms

  • question_answer
    The opposite vertices of a square are (1, 2) and (3, 8), then the equation of a diagonal of the square passing through the point (1, 2), is                             [Roorkee 1981]

    A)            \[3x-y-1=0\]                            

    B)            \[3y-x-1=0\]

    C)            \[3x+y+1=0\]                        

    D)            None of these

    Correct Answer: A

    Solution :

               Slope\[=\frac{8-2}{3-1}=3\].                    The diagonal is\[y-2=3(x-1)\Rightarrow 3x-y-1=0\].


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