3x9.63 find the product

Question 10jur's car can travel 340 miles on 12 gallons. jack's car can travel 390 miles on16 gallons. which person has the best mileage (miles per gallon) and what istheir mileage?

100 points, hi, i’m not sure how to get the equation from the graph and table.

The sum of two numbers is 12 and their difference is 18 what are the two numbers