I need help with 3. Determine whether each relation is a function.

So a function in math is where a relationship or expression involving one or more variables.
So, It would be yes it's a function, -2=1 yes it is 1=2 yes it is, 3=3 yes it is, and 4 1/2 is a 4 and a five (: Hoped this helps you!
Good luck!