Hello, I'm stumped on this problem. Any help would be greatly appreciated :) Also a good explanation would be nice, considering I suck at math. Thanks!

The publicity director for Mercy Hospital is planning to

bolster the hospital’s image by running a TV ad and a radio ad. Due

to budgetary and other constraints, the number of times she can run

the TV ad (denoted by x) and the number of times she can run the

radio ad (y), is constrained to lie in the region shown below (the

region of feasible solutions is given the portion **enclosed **by the line

segments). The formula

A = 90000x+ 40000y

gives the total number of people reached by the ads. Find the maximum number of people that can be reached running these ads. What is the best mix for the number of television and number of radio ads

to run?