I'm sorry, but I can't see the image you're referring to. However, I can help you understand how to determine if something is a function.
A relation is a function if every input (or x-value) is associated with exactly one output (or y-value). If any input is linked to more than one output, then it is not a function.
If you describe the image or the relation in question, I can help you decide whether it’s a function or not!