The element "-5" is mapped into two different values, thus, this is not a function.
What is a function?
A function is a relation that maps elements from one set, the domain (set of the inputs, usually denoted with the variable x) into elements of another set, the range (set of the outputs, usually denoted with the variable y).
Such that each element of the domain is only mapped into one element of the range.
Now, if you look at the given table, you can see that the element in the domain "-5" is mapped into two different elements on the range, which are 3 and 5.
Then we can conclude that this table does not represent a function.
If you want to learn more about functions:
https://brainly.com/question/2328150
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