Hi there!
To start, the domain of a relation or graph is the span of x values it contains.
Therefore, domain of this relation would be the x values of the coordinates (preferably listed in ascending order of value). If the same x value is listed more than one time, you write it only once in the domain set.
Your final answer should look like this: D:{-3,1,6}
Hope this helps and have a nice day!
