In mathematics, a changing quantity (one that can take various values), as opposed to a constant
. For example, in the algebraic expression y
+ 2, the variables are x
, whereas 4 and 2 are constants.
A variable may be dependent or independent. Thus if y
is a function
, written y
), such that y
+ 2, the domain of the function includes all values of the independent variable x
while the range (or co-domain) of the function is defined by the values of the dependent variable y
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