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Direct and Inverse Proportions | Class 8 maths chapter 13 | Inverse Proportions | Relation for Inverse Proportion | Direct Proportion | Relation for Direct Proportion | class 8 maths | ncert solution for class 8 maths | ncert class 8 maths | ncert solution | cbse | ncert

Dear Students, in this video we are going to study a very important topic as the Introduction of Direct and Inverse Proportions from Chapter 13 Direct and Inverse Proportions from CBSE Class 8 Maths. Hope you find it helpful & interesting. Enjoy Learning!

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Introduction to Direct and Inverse Proportions

There are so many situations in our life where we see some direct or indirect relationships between two things. Like,

– If the number of things purchased is increasing then the amount to pay will also increase.

– If the speeds of the car will increase then the time to reach the destination will decreases.

Variations

If the value of two objects depends upon each other in such a way that the increase or decrease in the value of one object affects the value of another object then these two objects are said to be in variation.

When two variables change in the same sense i.e as one amount increases, the other amount also increases at the same rate it is called direct proportionality. When two variables such as x and y are given, y is directly proportional to x if there is non zero constant k. The constant ratio is called constant of proportionality or proportionality constant.

Direct Proportion

If the value of a variable x always increases or decreases with the respective increase or decrease in the value of variable y, then it is said that the variables x and y are in direct proportion.

Two quantities are said to be directly proportional, if when one is increased by a certain factor other also increases by the same factor.

Inverse Proportions

If the value of variable x decreases or increases upon corresponding increase or decrease in the value of variable y, then we can say that variables x and

y are in inverse proportion.

All the above-mentioned topics are described in an interactive and efficient manner so that the students could easily understand them.

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