Hello from MrBillDoesMath!
Answer: No.
Discussion:
Look at the 1st and 4th members of the relation.
(7,2) (7,3)
Treating these as points, a vertical line passes through both of them ( x = 7 is the line) so there is no unique y value corresponding to x =7. So no functional relationship exists between them.
Regards, MrB