Question

Find the domain and range of the relation and determine whether it is a function.

Answer 1

domain (ur x values) are {-4,-1,1,4}
range (ur y values) are {-1,1,4}..if u have repeating numbers, u only have to write them once
yes, this is a function because there are no repeating x values

Answer 2

The domain is all of the x - values, while the range is all of the y - values. If there are two point with the same x - values, then it is not a function. Therefore, your answer would be A.
Hope this helped, and have a nice day!