Answer:
Domain: {-15, 5, 9}
Step-by-step explanation:
A relation is a set of ordered pairs in the form of (x, y) that can be plotted in a coordinate plane. The Domain of a relation is the set of all the x-values represented in the set of given ordered pairs. In the set of four ordered pairs given there are four x-values in each pair: 9, -15, 5 and 5. When we identify the domain, we put the values in order from least to greatest and if a number repeats, in this case 5, we only need to include it once. This gives us the final set of {-15, 5, 9}.
