Class 8 Maths Direct and Inverse Proportions Introduction


We see many situations in our daily life where we need to see

variation in one quantity bringing in variation in the other quantity.

Two quantities x and y are said to be in direct proportion if they

increase (decrease) together in such a Proportion is used to show

how quantities and amounts are related to each other. The amount that

quantities change in relation to each other is governed by proportion rules.


(i) If the number of articles purchased increases, the total cost also increases.

(ii) More the money deposited in a bank, more is the interest earned.  

(iii) As the speed of a vehicle increases, the time taken to cover the same

distance decreases.

(iv) For a given job, more the number of workers, less will be the time

taken to complete the work.



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