Answer: Yes, it does. Because each input value has one and only output value.
Explanation:
By definition, a relation is a function when each input value has one and only output value.
Then, to know if the table represents a function, you need to observe if each input value (in other words, each value of the variable "x") has only one output value (the output values are the values of the variable "y").
You can observe that each value of "x" has only one value of "y", therefore, you can conclude that the given table represents a function.