need help asap please!

IRT regularly has offers from companies for “Product Placement" in their shows. Companies will pay IRT, and you, if their products appear in the show. Coca Cola, Pepsi and Snapple have all agreed to pay participants if their products appear on the show, but participants must choose only one deal the amount depends on the length of your trip.

A.
Use the information to find an equation (y=mx+b) for the amount of Sponsorship Money (y) you can make for each day of the trip. Show your work and explain your steps below.

B.
Demonstrate how you know the equations work by checking your answer

c.
Explain in words how you found equation for coca cola and pepsi

Coca cola: (5days, $134) (10days, $164) (15 days, $194)

data:
pepsi: (10days, $160) (20days, $260)

snapple: (9days, -$30) (10days,$190)​