
In the following exercises, translate to a system of inequalities and solve.
317. Reiko needs to mail her Christmas cards and packages and wants to keep her 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.
(a) Write a system of inequalities to model this situation.
(b) Graph the system.
(c) Can she mail 60 cards and 26 packages?
(d) Can she mail 90 cards and 40 packages?

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