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9th Class Mathematics Number System and its Operations Question Bank Number Systems

  • question_answer
    If \[x\]and y are positive real numbers, then which of the following is CORRECT?

    A) \[x>y\Rightarrow -x>-y\]

    B) \[x>y\Rightarrow -x<-y\]

    C)  \[x>y\Rightarrow \frac{1}{x}>\frac{1}{y}\]

    D)  \[x>y\Rightarrow \frac{1}{x}<\frac{-1}{y}\]

    Correct Answer: B

    Solution :

    We have, \[x\]and y are positive real numbers. \[\therefore \]\[x>y\Rightarrow -x<-y\]and \[x>y\Rightarrow \frac{1}{x}<\frac{1}{y}\]


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