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Sometimes equation and formula are used interchangeably, but I was wondering if there is a difference.

For example, suppose we can calculate a car's fuel efficiency as:

mpg = distance traveled in miles / the fuel used in a gallon 

Is that an equation or formula?

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    According to http://www.mathsisfun.com/algebra/equation-formula.html, a formula shows a relationship between 2 or more variables, while an equation doesn't necessarily.2014-08-11

8 Answers 8