Answer
Domain: {-1, 0, 1, 2}, Range: {-2, -1, 0, 1}, Yes
Work Step by Step
The ordered pairs shown on the graph are (-1,1), (0,0), (1,-1), and (2,-2).
The domain is the set of all first components of the ordered pairs, or {-1, 0, 1, 2}. The range is the set of all second components of the ordered pairs, or {-2, -1, 0, 1}. This relation is a function because each component of the domain corresponds to exactly one component in the range.