You make necklaces and key chains to sell at a craft fair. The table shows the amounts of time and money it takes to make a necklace and a key chain, and the amounts of time and money you have available for making them. Write a system of four linear inequalities that represents the number x of necklaces and the number y of key chains that you can make.

Graph the system. Find the vertices (corner points) of the graph of the system.

You sell each necklace for $10 and each key chain for $8. The revenue R is given by the equation R=10x+8y . Find the revenue corresponding to each ordered pair in part (b). Which vertex results in the maximum revenue?