Eric works at a food cart that sells hamburgers and hot dogs. each hamburger costs $4.75 and each hot dog costs $3.75. on monday afternoon, he sold a total of 84 hamburgers and hot dogs and collected a total of $339. which system of equations could be used to find the number of hamburgers (x) eric sold on monday afternoon? a. x + y = 84 3.75x + 4.75y = 339 b. x + y = 339 3.75x + 4.75y = 84 c. x + y = 84 3.75x + 4.75y = 339 d. x + y = 84 4.75x + 3.75y = 339