SOLUTION: Is x^2 + 3y^2 = 9 a function? Why or Why not?

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Question 251240: Is x^2 + 3y^2 = 9 a function? Why or Why not?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
In mathematics, a function is a relation between a given set of elements called the domain and a set of elements called the codomain.
So we have a relation of x and y
http://en.wikipedia.org/wiki/Function_%28mathematics%29