Please help Thank you!!

How do you write y-10=2 (x-8) in standard form

Find the distance between (7,-6) and (-3,-9)

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?