At a corner gas station, the revenue R varies directly with the number g of gallons of gasoline sold. If the revenue is 19.50 when the number of gallons sold is 5, find a linear equation that relates revenue R to the number g of gallons of gasoline?

Then find the Revenue R when the numbers of gallons of gasoline sold is 8.5.

19.50/5=x/15.5 is that how its started?