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Inverse variation if two quantities x and y vary with each other in such a manner that the product of remains constant and is positive then we say that a and b vary inversely as each other or a varies inversely as b and b varies inversely as a

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Direct variations if two quantities a and b vary with each other in such a manner that the ratio (a)/(b) remains constant and is positive then we say that a and b vary directly with each other or a and are in direct variation

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If x varies inversely as y, then

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If on increasing a, b decreases in such a manner that _______ remains ______constant and positive, then a and b are said to vary inversely with each other.

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NCERT EXEMPLAR-DIRECT AND INVERSE PROPORTIONS -EXERCISES
  1. If one angle of a triangle is kept fixed then the measure of the remai...

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  2. Direct variations if two quantities a and b vary with each other in su...

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  3. Inverse variation if two quantities x and y vary with each other in su...

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  4. If x varies inversely as y and when x = 6, y = 8, then for x = 8 the v...

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  5. The number of workers and the time to complete a job is a case of dire...

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  6. For fixed time period and rate of interest, the simple interest is dir...

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  7. Which of the following are in inverse proportion? (i) The number...

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  8. In the following questions, which of them vary directly and which vary...

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  9. In the following questions, which of them vary directly and which vary...

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  10. In the following questions, which of them vary directly and which vary...

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  11. If x varies inversely as y and x = 20 when y = 600, find y when x = 40...

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  12. The variable x varies directly as y and x = 80 when y is 160. What is ...

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  13. l varies directly as m and l is equal to 5, when m=2/3 Find l when m...

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  14. If x varies inversely as y and y = 60 when x = 1.5. Find x. when y = 4...

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  15. In a camp, there is enough flour for 300 persons for 42 days. How long...

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  16. A contractor undertook a contract to complete a part of a stadium in 9...

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  17. Sobi types 108 words in 6 minutes. How many words would she type in ha...

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  18. A car covers a distance in 40 minutes with an average speed of 60 km/h...

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  19. It is given that l varies directly as m. Write an equation which rel...

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  20. It is given that l varies directly as m. Find the constant of propor...

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