### Other Chapters For 8th

• 8th-class English Chapter 28

Sir John Macpherson proposed to call a meeting of experts from all countries in a week’s...
• 8th-class English Chapter 27

Duttada was neither a scientist nor an astronomer. But star-gazing was his hobby. He used to...
• 8th-class English Chapter 26

An honest boy is on his way to school carrying money to pay the school fees. The sight of crisp,...
• 8th-class English Chapter 25

Mr. Framton Nuttel has just moved to a replacement town. While visiting one of his sister’s...
• 8th-class English Chapter 24

The story is about a boy named Ranji whoshifted to a new place. It was a hot day and he was...
• 8th-class English Chapter 23

Princess September is a story of a princess of Siam, which is now known as the Thailand. The...
• 8th-class Chapter 22

Hafeez was an unhappy but carefree boy during his school days.He loved doing different things...
• 8th-class English Chapter 21

Once a selfish giant welcomed the children to his previously forbidden garden and is eventually...
• 8th-class English Chapter 19

All the animals began to work for Man, but the Camel lived in a desert because he was idle and...
• 8th-class English Chapter 20

A 11 year old child named Vellu runs from home and reaches Chennai Central in Kanyakumari...

# 8th Class Chapter No 13 - Direct & Inverse Proportion in Maths for CBSE NCERT

In mathematics, two variables are proportional if there is always a constant ratio between them. The constant is called the coefficient of proportionality or proportionality constant. If one variable is always the product of the other variable and a constant, the two are said to be directly proportional. x and y are directly proportional if the ratio is constant. If the product of the two variables is always a constant, the two are said to be inversely proportional. x and y are inversely proportional if the product xy is constant. To express the statement "y is directly proportional to x" mathematically, we write an equation y = cx, where c is the proportionality constant. Symbolically, this is written as y ∝ x.
Posted in 8th on February 13 2019 at 03:29 PM

### CBSE NCERT 8th CLASS Maths OTHER CHAPTERS

• 8th-class Maths Chapter 16

The concepts discussed in this chapter. Interchanging the digits of a number. The...
• 8th-class Maths Chapter 12

The power of a number indicates the number of times it must be multiplied. It is written in...
• 8th-class Maths Chapter 15

Graphical presentation of data is easier to understand.(i) A bar graph  is used to show...
• 8th-class Maths Chapter 14

In mathematics, factorization (also factorisation in some forms of British English) or factoring...
• 8th-class Maths Chapter 11

NCERT Solutions for Class 8 Maths Chapter 11 These solutions will help you to effectively...
• 8th-class Maths Chapter 10

A shape is the form of an object or its external boundary, outline, or external surface, as...
• 8th-class Maths Chapter 9

NCERT Solutions for Class 8 Maths Chapter 9  Algebraic Expressions and Identities will become...
• 8th-class Maths Chapter 8

Introduction to NCERT Solutions for Class 8 Maths Chapter 8 NCERT solutions helps you  break...
• 8th-class Maths Chapter 7

In mathematics, a cube root of a number x is a number y such that y3 = x. All real numbers...
• 8th-class Maths Chapter 6

NCERT Solutions for Class 8 Maths Chapter 6 Scoring sensible marks in exams is the dream of...