To determine if a relation is a function, we need to check if each input (first element of each ordered pair) is associated with exactly one output (second element of each ordered pair).
Looking at the set of ordered pairs you provided:
- (7, 9)
- (16, 1)
- (6, 0)
- (18, 11)
The inputs are 7, 16, 6, and 18. Each of these inputs is unique; none of them repeats. Since every input corresponds to exactly one output, this relation is indeed a function.