I have a classroom where I answer algebra questions. Here is the link and I'll try to answer your question. Let me know if you can't access it. It's not letting me post the link so ill try to put it in the comments.

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?