Answer
$\text{This relation is a function.}$
$\text{Domain :} \{-2,-1,0,1 \}$
$\text{Range :} \{4,0,1 \}$
Work Step by Step
A relation is a function if each element in the first set is associated with exactly one element in the second set.
This relation is a function because there are no ordered pairs with the same first element and different second elements.
The domain (set of all first coordinates) of this function is $\{-2,-1,0,1 \}$
The range (set of al second coordinates) of this function is $\{4,0,1 \}$
