Bryan needs to mail cards and packages and wants to keep the mailing costs to no more than $500. The number of cards is at least 4 more than twice the number of packages. The cost of mailing a card (with pictures enclosed) is $3 and for a package the cost is $7. Show your work for each part. a. Write a system of inequalities to model this situation. b. Graph the system. c. Can he mall 60 cards and 26 packages? d. Can he mail 90 cards and 40 packages?​