Answer:
The first set of ordered pairs is a function, because no two ordered pairs have the same firstcoordinates with different second coordinates. The second example is not a function, because it contains the ordered pairs (1,2) and (1,5). Thesehave the same first coordinate and different second coordinates.
Step-by-step explanation:
You could set up the relation as a table of ordered pairs. Then, test to see if each element in the domain is matched with exactly one element in the range. If so, you have a function!
