It can be though it is more often used to denote a variable.
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It means a value that isn't a variable.For example, "X" is a variable, since its value can vary.Now, the number "33" is a constant, because its value is constant, or unchanging.(If 33 were to become 34, it wouldn't be 33 anymore.)(If x's value were to change from 5 to 8, it's still x, but its value varied.)
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Direct variation is the ratio of two variable is constant. Inverse variation is when the product of two variable is constant. For example, direct variation is y = kx and indirect variation would be y = k/x .
A constant is a value that never changes such as 4, 6.5, 3/4, pi, or the square root of 5. This is different from a variable where the value varies like x. In the expression 5x, 5 is a constant and x is a variable.
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