isaac owns a food truck that sells tacos and burritos. he only has enough supplies to make 130 tacos or burritos. he sells each taco for $4.25 and each burrito for $8.50. isaac must sell a minimum of $850 worth of tacos and burritos each day. if xx represents the number of tacos sold and yy represents the number of burritos sold, write and solve a system of inequalities graphically and determine one possible solution.