JCECE Engineering JCECE Engineering Solved Paper-2012

  • question_answer
    The equation of the plane passing through the line of intersection of the planes \[2x-y=0\] and \[3z-y=0\] and perpendicular to the plane \[4x+5y-3z=8\] is

    A) \[2x+17y+9z=0\]             

    B) \[28x-17y+9z=0\]

    C) \[2x+17y-9z=0\]              

    D)  None of these

    Correct Answer: B

    Solution :

    The equation of plane passing through the intersection line of the planes \[2x-y=0\] and \[3z-y=0\] is                 \[(2x-y)+\lambda (3z-y)=0\] \[\Rightarrow \]               \[2x-(1+\lambda )y+3\lambda z=0\]                        ... (i) According to the question, plane (i) will be perpendicular to                 \[4x+5y-3z=8\]                  ... (ii) \[\therefore \]  \[2\cdot 4-(1+\lambda )5+3\lambda (-3)=0\] \[\Rightarrow \]               \[8-5-5\lambda -9\lambda =0\] \[\Rightarrow \]               \[14\lambda =3\Rightarrow \lambda =\frac{3}{14}\] Thus, required plane is                 \[(2x-y)+\frac{3}{14}(3z-y)=0\] \[\Rightarrow \]               \[28x-17y+9z=0\]


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