Write a system of equations to describe the situation below, solve using elimination, and fill in the blanks.
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Diego is a shoe salesman, and he works on commission. This week, there is a special
incentive to sell shoes and boots by a certain company. Yesterday, Diego sold 3 pairs of shoes
and 4 pairs of boots, earning $87 in commission. Today, he sold 6 pairs of shoes and 5 pairs
of boots, earning a total commission of $120. How much does Diego earn for the sale of each
type of footwear?
Diego earns $
for each pair of shoes and $
for each pair of boots.