The relationship that is not a function is the one in the bottom left.
What is a function?
A function is a relationships that maps elements from a set (the domain) into another set (the range). Such that each element from the domain is only mapped to only one element in the range.
This means that if in a relationship we have an element of the domain is being mapped into two or more elements of the range, then the relationship is not a function.
Now let's look at the given options.
If you look at the bottom left one (I assume it would be the third option) you can see that the element "5" in the domain is being mapped into two different elements of the range; 2 and 4, then we can conclude that this is not a function.
If you want to learn more about functions:
https://brainly.com/question/2328150
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