|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
(iv) For a given job, more the number of workers, less will be the time
taken to complete the work.