answer:
a function
Explanation:
hello there!
as you said, there is only able one output ( y ) for each input ( x ) for it able to become a function
here is a little example of a "table" to help me explain this a little better for you!
input ( x ) | output ( y)
8 | -3
3 | 8
9 | 4
-2 | 2
since none the inputs have more then one output then that means it is a function
hope this helps you and please let me know if i had made a mistake in the problem, have a wonderful day!! :D