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Lots of the other letters of the alphabet are used for either constant numbers or variables that are based on certain formula.
C for instance is the speed of light in a vacuum (a constant)
m is normally used for mass (a variable).
x and y were most likely used as they were letters least likely to be used for representation of anything else and so the idea stuck to use them as calculable variables.
Hope this helps.
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∙ 14y ago
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