## CBSE Revision Notes Class 8 Maths Chapter 13: Direct and Inverse Proportions

CBSE Revision Notes Class 8 Maths Chapter 13 Direct and Inverse Proportions are provided to help the students understand and revise the concepts right from the beginning. The concepts taught in Class 8 are important to be understood as these concepts are continued in classes 9 and 10. To score good marks in Class 8 mathematics examination, it is advised to solve questions provided in the Revision Notes Class 8 Maths Chapter 13. These revision notes for Class 8 Maths help the students to revise all the concepts in a better way.

**Swiflearn** provides Revision Notes and keynotes chapter wise for the CBSE board exam in an easy-to-understand, free downloadable PDF format so students can use it for their studies and score better in their board exams. The CBSE Class 8 Revision Notes are made for the main subjects of Science and Maths. These core subjects are very critical as they are the stepping stones and plays a crucial role in student’s future. They might be tricky for students. The CBSE Class 8 Revision Notes for each chapter will enable them to have an expert studying pattern with which they can enjoy learning the subject and perform better in the exams.

CBSE Class 8 Maths Revision Notes are designed keeping in my mind the exam pattern and syllabus of NCERT 2020-21. Students can download the PDF for free and practice the questions to score well in the coming exams.

## CBSE Revision Notes Class 8 Maths Chapter 13: Direct and Inverse Proportions

**Proportion:-**

If one variable is always the product of the other and a constant, the two are said to be directly proportional. If the product of the two variables is always constant, the two are said to be inversely proportional. x and y are inversely proportional if the product xy is constant.

**Direct Proportion:-**

As the value of x increases or decreases, value of y also increases or decreases respectively in such a way that the ratio (x/y) does not change; it remains constant (say k). In the given example (x/y) = 1/15. We can say that x and y are in direct proportion, if x/y = k or x = ky. When two quantities x and y are in direct proportion (or vary directly) they are also written as x α y.