Jason owns a food truck that sells tacos and burritos. He sells tacos for $4.75 embryos for $7.50. Yesterday he made a total of $790 in revenue from all burrito and taco sales and there were twice as many burittos sold as were tacos sold. Write a system of equations that could be used to determine the number of taco sold in the number of burritos sold. Define the variables that you used to write the system.