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- CBSE Class 8 Maths Revision Notes Chapter 13 - Direct and Inverse Proportions
- Direct and Inverse Proportion
- CBSE Class 8 Maths Revision Notes Chapter 13 - Direct and Inverse Proportions

Register Now. Hey there! We receieved your request. There are so many situations in our life where we see some direct or indirect relationship between two things. 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. This shows that as the no. The ratio remains the constant in the direct proportion.

Need for Concepts of Variation To find out the quantity of each item needed by Mohan or, the time taken by five students to complete the job, we need study some concepts of variation. We will study the following types of variation:. Inverse proportion Two quantities x and y are said to be in inverse proportion, if whenever the value of x increases or decreases , then the value of y decreases or increases in such a way that xy remains constant. The first way is named as direct variation whereas the second way is named as an inverse variation. Direct Proportion If two quantities are related in such a way that an increase in one leads to a corresponding proportional increase in the other, then such a variation is called direct variation.

Review Notes for Direct/Inverse Variation. Algebra 1. Direct Variation. Inverse Variation. Review. What is it? A set of inputs and outputs with. A set of inputs and.

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Equations that describe the relationship between two variables in a sentence express the variation between those variables. Examples of types of variation include direct, inverse, joint, and combined variation. In direct variation, as one variable is multiplied by a constant and increases, another variable the quotient also increases. Her total wages vary directly with the amount of hours she works. If the hours she works are plotted on the x axis against her wages on the y axis, the resulting line is a straight line showing direct variation.

Example 4 — The number of minutes needed to solve an exercise set of variation problems varies directly as the number of problems and inversely as the number of people working on the solutions. It takes 4 people 36 minutes to solve 18 problems. How many minutes will it take 6 people to solve 42 problems. Example 5 — The electrical resistance of a wire varies directly as its length and inversely as the square of its diameter. A wire with a length of inches and a diameter of one-quarter of an inch has a resistance of 20 ohms. Find the electrical resistance in a inch wire with the same diameter.

Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. Direct and Inverse Proportion. We come across many such situations in our day-to-day life, where we need to see variation in one quantity bringing in variation in the other quantity. For example:. Observe that change in one quantity leads to change in the other quantity. This means that both the quantities are in proportion.

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## Geoffrey P.

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## Iosef M.

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## Tim D.

In mathematics , two varying quantities are said to be in a relation of proportionality , multiplicatively connected to a constant ; that is, when either their ratio or their product yields a constant.