A set of ordered pairs is called a [tex]\textit{relation}[/tex]:
{(14,15),(5,7),(3,10),(11,1),(5,8)} is a relation.
The pairs are called "ordered" because the order is important, for example:
(3, 4) and (4, 3) are 2 different things. In the first pair 3 is the [tex]\textit{first coordinate}[/tex], but in the second one 3 is [tex]\textit{second coordinate}[/tex]
A relation is a [tex]\textit{function}[/tex] if no 2 first coordinates of the points are equal.
In the given relation, the first coordinates of points (5,7) and (5,8) are equal, so the relation is not a function.
Answer: No
