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Summary

  • Direct Proportion: Two quantities are said to be in direct proportion if they increase (decrease) together in such a manner that the ratio of their corresponding values remains constant.
  •        
           or
          
          (
    k is a positive number )

          Then vary directly.

          If are the values of corresponding to the values of respectively then

  • Inverse Proportion: Two quantities are said to be in inverse proportion if an increase in causes proportional decrease in (vice - versa) in such a way that the product of their corresponding values remains constant.

     

    Example : , then vary inversely

    In this case if are the values of corresponding to the values of respectively then,





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