A yoga studio offers memberships that cost $20 per month for unlimited classes. The studio also accepts walk-ins, charging $5 per class. If someone attends enough classes in a month,
the two options cost the same total amount. How many classes is that?

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.