Answer:
((2,-5),(4,-5),(6,2),(8,3))
((-1,5),(3,5),(6,5),(9,5))
((0,3),(4,2),(-1,7),(0,3))
Explanation:
For a set of ordered pairs to be a function, no x value can have two different y values.
In the three functiosn above, every x value has one and only one y value corresponds with it.
((0,3),(4,2),(-1,7),(0,3)) Is still a function because when x is zero, there is only one y value that corresponds with it, which is 3.