Answer
Domain: {-1, 1, 2, 3,}, Range: {1, 2,}, Yes
Work Step by Step
The ordered pairs shown on the graph are (-1,2), (1,1), (2,1), and (3,1).
The domain is the set of all first components of the ordered pairs, or {-1, 1, 2, 3}. The range is the set of all second components of the ordered pairs, or {1, 2}. This relation is a function because each component of the domain corresponds to exactly one component in the range.