The Shoe Store makes $100 per pair of shoes they sell. What is the equation for The Shoe Store's income if x is the number of shoes sold and y is dollars?

It costs The Shoe Store $500 to run the store, plus $50 for each pair of shoes. What is the equation for the Shoe Store's expenses if x is the number of pairs of shoes sold and y is dollars?

How many pairs of shoes does the shoe store need to sell in order to break even? Set up a system of equations.​