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In math y or any other letter is known as a variable. Because to figure out the problem you must find out the value of y.
In expressions such as "x-y", both "x" and "y" can have any value. The value of "x-y" will depend on what the value of "x" and the value of "y" are.
A variable is a value that is not always the same number. In alegebra, it is represented as a letter. In the equasion Y=4X+5, 'Y' and 'X' are both variables.
The answer is 37478482993
y is a function of x iffor each value of x (in the domain) there is a value of y, andfor each value of y (in the range) there is at most one value of x.