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Direct Proportion

If two quantities a and b are related in such a way that an increase or decrease in b results in a proportionate increase or decrease in a, then a and b are said to be directly related or in direct proportion.
 

This is expressed asDescription: 4618.png(a is directly proportional to b).
 

When Description: 4612.pngwe can write a = bk, where k is a constant known as the constant of proportionality.

 

Example: The cost of travel increases when the price of fuel increases. Thus, cost of travel  price of fuel.





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