Question

Identify the domain and range of the relation. Is the relation is a function why why not {(-3,1), (0,2), (1,5), (2,4), (2,1)

Answer 1

you have a set of (x,y) pairs

The domain is the set of all the x-values
The range is the set of all the y-values
not a function, because x=2 appears more than once.