Final answer:
Santiago's car travels 9.2 miles less per gallon of gas than Grayson's car, with Santiago's car getting 31.9 miles per gallon and Grayson's getting 41.1 miles per gallon.
Step-by-step explanation:
The student is asking how many miles less Santiago's car can travel on one gallon of gas compared to Grayson's car. Grayson's car travels 328.8 miles on 8 gallons of gas. To calculate the miles per gallon for Grayson's car, we divide the total miles driven by the gallons of gas used. So Grayson's car gets 41.1 miles per gallon (328.8 miles ÷ 8 gallons).
Santiago's car has a given rate of 31.9 miles per gallon, represented by the equation y = 31.9x, where x is the number of gallons. To find out how much less Santiago's car travels on one gallon compared to Grayson's, we subtract Santiago's miles per gallon from Grayson's: 41.1 miles/gallon - 31.9 miles/gallon = 9.2 miles/gallon. Therefore, Santiago's car travels 9.2 miles less per gallon than Grayson's car.