The equation relating the gallons of gasoline used (g) to the total number of miles driven (m) is:
m = 17.9g
To find the rate of gas usage in miles per gallon, we need to rearrange this equation to solve for g, which represents the number of gallons of gasoline used for a given distance:
g = m/17.9
This equation tells us that the number of gallons of gasoline used is equal to the total number of miles driven (m) divided by a constant rate of 17.9 miles per gallon.
Therefore, the rate of gas usage in miles per gallon is 17.9. This means that for every 17.9 miles Jai drives, he uses one gallon of gasoline.