Bill makes leather shoes. He charges $45 for a pair of women's shoes and $50 for a pair of men's shoes. He sells x pairs of women’s shoes and y pairs of men’s shoes each week and earns a total income of $2,500.
This situation can be represented by the equation
. If Bill has no female customers during a particular week, he needs to sell
pairs of men’s shoes to earn his weekly income of $2,500.