9514 1404 393
Answer:
True
Explanation:
Make a list of the first number in each ordered pair:
{-4, 2, 1, -1}
You may want to put these in order. (Not necessary; can be helpful.)
{-4, -1, 1, 2}
If any values are repeated, the relation is NOT a function.
Here, all the values are different, so this relation is a function.