A truck traveling from one city to another is to be loaded with two types of cargo. Let x be the number of crates of the first The number of crates of the first cargo, x, is equal to cargo and y the number of crates of the second cargo. How many crates of each cargo should be shipped in order to yield the greatest earnings if the objective function is 13x + 8y? (See the graph of the feasible set below.) y=- - x+6 y = 2x y = -x+ 120 feasible