Here's the question you clicked on:
InsanelyChaotic
A relation where every x-value produces a unique y-value is called a ___________. domain range function relation
OK, so what do each of those terms mean? The one you can cross off is relation because it is in the question and an answer. It can't be both the question and the answer, so it is gone.
Most books have a drawing like this that goes with this section: |dw:1366664951844:dw| Now, the domain, range, and function are all involved in that drawing. This question relates to which one represents the entire relationship as a whole.