Question

1. Determine if the set of ordered pairs is a relation or a function.

{(0,0), (0, 2), (0, 3), (0,4)}

Answer 1

This is just a relation.

Explanation:

It is easy to see if a set of ordered pairs is a relation or a relation that is a function.

If all the points are distinct, then you just have to look at the
`x`-coordinates.

If all the
`x`-coordinates are different, then it is a function. Otherwise, it is a just a relation.

So this cannot be a function because there is at least two different points that have
`x=0`.