Final answer:
The domain of the set of points {(1, -2), (-2, 0), (-1, 2), (1, 3)} is the set of x-values, which are unique, resulting in the domain {-2, -1, 1}.
Step-by-step explanation:
The domain of a set of ordered pairs is the set of all the first components (x-values) from each ordered pair. Given the set of points {(1, -2), (-2, 0), (-1, 2), (1, 3)}, we can see that the domain is the set of x-values. It is important to note that each element in the domain should be unique. In our given set, we have repetitive 1s, so we only take it once. Therefore, the domain is {-2, -1, 1}.