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# What is the difference between a variable and a constant?

A constant is held constant (as the name suggests), where as a variable is a number that is aloud to change. For instance, if we let y=5+x, here, 5 is constant because it does not change, where as x is aloud to vary. For instance, we could consider x over a certain range, say x=1, x=2, x=3 and get a different y for respective x. Hope this helps.  John Parry
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