A company uses two machines to solder circuit boards, an oven and a wave soldering machine. A circuit board for a calculator needs 4 minutes in the oven and 2 minutes on the wave machine, while a circuit board for a toaster requires 3 minutes in the oven and 1 minute on the wave machine.

(A) How many circuit boards for calculators and toasters can be produced if the oven is available for 5 hours? Express your answer as a linear inequality with appropriate nonnegative restrictions and draw its graph.

(B) How many circuit boards for calculators and toasters can be produced if the wave machine is available for 2 hours? Express your answer as a linear inequality with appropriate nonnegative restrictions and draw its graph.