Find domain and range

Find domain and range

For every relation, there are two important sets of elements called the domain and range.


Domain and Range


In a relation, the set of all values of the independent variable (x) is the domain. The set of all values of the dependent variable ( y) is the range.


{(3, 21), (4, 2), (4, 5), (6, 8)}

The domain, the set of x-values, is {3, 4, 6}; the range, the set of y-values, is {21, 2, 5, 8}. This relation is not a function because the same x-value 4 is paired with two different y-values, 2 and  5.


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