Answer:
Yes.
From Definition - A special relationship where each input has a single output.
Check if there is going to be one y for one x.
Explanation:
- Re-write it in terms of y=…., meaning solve for y
- If it looks like you have two equations then it is a relationship -case a
- If you need to prove that one has a function for case b, you would point out that if you substitute any value you will get some value in Reals.