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JEE Main & Advanced Mathematics Functions Question Bank Self Evaluation Test - Relations and Functions-I

  • question_answer
    If \[f(2x+3y,2x-7y)=20x,\] then \[f(x,y)\] equals

    A) \[7x-3y\]

    B)        \[7x+3y\]

    C) \[3x-7y\]

    D)        \[3x+7y\]

    Correct Answer: B

    Solution :

    [b] Let \[2x+3y=A\]and \[2x-7y=B\] Then, \[7A+3B=20x\]\[\therefore f(A,B)=7A+3B\] \[\therefore f(x,y)=7x+3y\]


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