# How do you find the domain and range and determine whether the relation is a function given {(-2.5,1), (-1,-1), (0,1), (-1,1)}?

##### 1 Answer

**Domain: #{-2.5, -1, 0}#**

**Range: #{-1, 1}#**

**This relation is NOT a function.**

#### Explanation:

The domain is also known as the

Since we know that a coordinate is written in the form

However, when we write a domain or range, we typically put the values from least to greatest and do not repeat numbers. Therefore, the domain is:

All the

Again, put them from least to greatest and do not repeat numbers:

In a function, each

Hope this helps!