# What is the domain of the following relation: r: {(3, 5), (8, 6), (2, 1), (8, 6)}.

We will use the concept of set, relation, and function to find the domain.

## Answer: The domain of the following relation: r: {(3, 5), (8, 6), (2, 1), (8, 6)} is : { 2, 3, 8 }

Let's look into the steps below

**Explanation:**

The above relation r: {(3, 5), (8, 6), (2, 1), (8, 6)} is a function because a function is a relation where each input in set X has only one output in set Y.

The elements in set X are known as domain and elements in set Y are known as range.

Hence, a domain can be defined as the x-coordinate values given in the relation.

For the given relation the x-coordinate values are {3, 8, 2, 8}