**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.**

**Example**

{(**3**, 2**1**), (**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 {2**1**, **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.