Write a system of equations to describe the situation below, solve using substitution, and fill in the blanks. Eduardo is starting a business selling handmade necklaces. He has decided to invest an initial amount of $69 for advertising, and materials cost $7 for each necklace he makes. Eduardo can sell his creations for $10 per necklace. Once he makes and sells a certain number of necklaces, he will break even, with identical expenses and sales. What would the total expenses and sales be then? How many necklaces would that take?

Eduardo would have total expenses and sales $
after selling
necklaces.