Answer:
Not a function
Step-by-step explanation:
Each input can have only have one output.
x(1) can't equal both -1 and 3 at the same time.
x(2) can't equal both 4 and 0 at the same time.
x(3) can't equal both 5 and 1 at the same time.
In other words there can't be multiple X's equalling different things.
