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2016-03-13T13:54:28+08:00

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Assigning letters because you don't know the value to complete the equation 
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a vaiable is a letter that represents another number. it is sometimes paired with a constant so they multiply to each other. variables are used in formulas so you can substitute them with other variables or just number so you can use the formulas. variables are also used in equations
2016-03-13T17:38:13+08:00

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A variable is basically a letter or a symbol that represents an unknown quantity.

Hope it helps =)

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