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Direct and Inverse Variation

Direct Variation

If the relation between two quantities is such that an increase (decrease) in one quantity results in increase (decrease) in other quantity, the quantities are said to vary directly.

    Some examples of direct variations

  1. Number of articles is directly proportional to cost of articles.
  2. Number of workers is directly proportional to work done.

Indirect Variation

If the relation between two quantities is such that a increase (decrease) in one quantity results in decrease (increase) in other quantity, the quantities are said to vary indirectly or inversely.

    Some examples of indirect variations

  1. Speed of a car is inversely proportional to the time taken to cover a certain distance.
  2. Number of workers is inversely proportional to time taken to complete the work..
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