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However, the domain and range are not defined in an absolute way. You can choose any domain that you like (within reason) and the definition of the range will follow. Or conversely.
Suppose the equation is x = y + 12
Then you can, for example, define the domain (values of x) as the set of numbers 1, 3, and 97.2. The range, in that case will be -11, -9 and 85.2
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The domain is the the set of inputs. (x) The range is the set of oututs. (y)
x is a letter often used as a variable. It can be in the range or the domain. However, in elementary algebra, the variable x is most often used for the domain and f(x) =y for the range.
Quite simply, the domain is the input and the range is the output of a function. If your using a typical X-Y axis graph, it may be useful to view the X axis as where the domain lies. The Y axis is where the range lies. Y= f(x) or Range = f(domain)
A domain is the value of x, and range is the value of y
The Domain and Range are both the set of real numbers.