![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Observe the table, the element 3 in the domain is paired with two elements 4 and 4 range.
\The two elements are same, so the element 3 in the domine with one element in range.
\So, this mapping represents a function.
\NOTE:
\Function: A function is a relation in which each element of the domain is paired with exactly one element of the range.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
Yes, the relation is a function.