To determine if a relation is a function, you need to ensure that each input (or x-value) maps to exactly one output (or y-value). If any input corresponds to more than one output, then it is not a function.
Since I can't see the image you are referring to, I cannot directly answer your question. However, if every x-value in your relation has only one corresponding y-value, then the answer is "Yes," it is a function. If any x-value has more than one y-value, then the answer is "No," it is not a function.
If you can describe the relation or provide more details, I'd be happy to help you further!