Parker owns a food truck that sells tacos and burritos. He sells each taco for $4.50
and each burrito for $6.75. Yesterday Parker made a total of $576 in revenue from all
burrito and taco sales and there were twice as many burritos sold as there were tacos-
sold. Write a system of equations that could be used to determine the number of tacos
sold and the number of burritos sold. Define the variables that you use to write the
system.