Ray needs to mail his Christmas cards and packages and wants to keep the mailing costs to no more than $400 . The number of cards is at least 20 more than twice the number of packages . The cost of mailing a card is $ 1 and a package cost is $ 5. a . Write a system of inequalities to model the problem . b Graph the system . Can he mail 120 cards and 50 packages ? d . Can he mail 220 cards and 100 packages ?