Final answer:
To determine if a relation is a function, we need to check if each x-value is paired with only one y-value.
Step-by-step explanation:
A relation is a set of ordered pairs where each input is paired with exactly one output.
To determine if a relation is a function, we need to check if each x-value is paired with only one y-value. If there are no x-values that repeat, then the relation is a function.
In this case, the relation is a function because each x-value (-4, -1, 2, 5) is paired with only one y-value (8, 2, -4, -10).