Can you please explain how to get to this answer and the steps you took :))

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

Mr. thompson is on a diet. he currently weighs 260 pounds. he loses 4 pounds per month. what part of the story makes the relationship not proportional?

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?