To determine whether a relation is a function, you need to check if each input (or x-value) corresponds to exactly one output (or y-value). Here's how you can sort relations into two piles: "Function" or "Not a Function."
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Function: If for every x-value, there is only one y-value.
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Not a Function: If there is at least one x-value that corresponds to more than one y-value.
If you provide specific relations or sets of points, I can help you evaluate each one to classify them into the appropriate pile. Please share the details of the relations you're looking at!