For each of the relationships between xxx and yyy shown on the graphs in the table below, w indicate whether the relationship between xxx and yyy is proportional by checking the appropriate box in the table. Plz help.

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18