Question

1)) Look at this set of ordered pairs:(9, -7)(5, 11)(15, 3)(9, 13)(1) Is this relation a function?

Answer 1

In order to check if the set of points represent a function, every value of x can only have one corresponding value of y.

Looking at the set, we have two points with x = 9 that have different values of y, therefore this set can't be a function.

So this set of ordered pairs is a relation.