Answer
Not a function.
Domain: $\{\text{Bob},\text{John},\text{Chuck}\}$
Range:$\{\text{Beth},\text{Diane},\text{Linda},\text{Marcía}\}$
Work Step by Step
A relation is a function if for all $x$ values there is exactly one corresponding $y$ value.
The domain is the set of values the function can take and the range is the set of values which the function “produces” from the values of the domain.
The given relation is not a function because there is one value in the first set (Bob) that has two corresponding values in the second set (Beth and Diane).
Domain: $\{\text{Bob},\text{John},\text{Chuck}\}$
Range:$\{\text{Beth},\text{Diane},\text{Linda},\text{Marcía}\}$
