Description: Learn to determine if a relation given by a set of ordered pairs is a function. Created by Sal Khan and Monterey Institute for Technology and Education. Is the relation given by the set of ordered pairs shown below a function? So before we even attempt to do this problem, right here, let's just remind ourselves what a relation is and what type of relations can be functions. You can view them as the set of numbers over which that relation is defined.*Teacher Advisor is 100% free.