Billy is comparing gasoline prices at two different gas stations.
• At the first gas station, the equation c= 2.80g gives the relationship between g, the number of gallons of
gasoline, and c, the total cost, in dollars.
• At the second gas station, the cost of 2.5 gallons of gasoline is $8.30, and the cost of 5 gallons of gasoline is
$16.60.