Class 8 Maths Direct and Inverse Proportions Introduction

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.

Example:

(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.

Class_8_Maths_Direct_&_inverse_Proportions_Beam_Balance

Class_8_Maths_Direct_&_inverse_Proportions_Example1

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