9th grade
posted by NIki .
I am having trouble trying to figure out how to work this problem:
Determine if each relation is a function.
1. Relation: (2,2),(3,2,),(4,1),(5,2)
How do i do this???????

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 :) 
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=xvDn4FOJQ