I'm unable to access external links or images. However, I can help you understand how to determine if something is a function.
A relation is considered a function if every input (x-value) has exactly one output (y-value). This means that for any x-value in the dataset, there cannot be multiple corresponding y-values.
If you can describe the image or provide the data points/graph shown, I can help you figure out if it represents a function or not.