## Algebra 1: Common Core (15th Edition)

Let x = the number of bicycles sold and let y = the number of dollars of expense or income. Expense: $y = 60x + 2400$ Income: $y = 120x$ Use substitution since both equations are solved for $y$. $60x + 2400=120x$ $60x=2400$ $x=40$ The store must sell 40 bicycles each month to break even.