I am having trouble trying to figure out how to work this problem:

Question

Determine if each relation is a function.

1. Relation: (-2,2),(3,2,),(4,-1),(5,-2)
How do i do this???????

Answer 1

i am having the same trouble too. i think if the x points are different, the its a function. but if not, then its not a function.

seeking for help also :)

Answer 2

By definition, it is a function.

Have you learned about the Vertical Line Test?

Here is a short video that explains it.
Too bad that the guy is sort of dry in his explanation.

http://www.youtube.com/watch?v=-xvD-n4FOJQ