Two gallons of gasoline cost $7.96, 5 gallons cost $19.90, and 12 gallons cost $47.76. Which equation gives the total cost y of x gallons? (It’s the first question, 7a. I don’t get it pls help will give “thanks” and brainiest answer)

Two gallons of gasoline cost 796 5 gallons cost 1990 and 12 gallons cost 4776 Which equation gives the total cost y of x gallons Its the first question 7a I don class=