Each set of ordered pairs (x, y) represents a relationship with input, x, and output, y. Which relationship is a function?
{(0,1),(0,2), (0,3)
(1,1),(2,2), (3,3)}
[(1,1), (2,1),(3,1))
[(1,1),(2,2), (2,-2)]
|(1,-1), (2,-2), (3,-3)}