Manuel is putting money into savings account. He starts with $550 in the savings account, and each week he adds $70. Let S represent the total amount of money in the savings account (in dollars), and let W represent the number of weeks Manuel has been adding money. Write an equation relating S to W. Then use this equation to find the total amount of money in the savings account after 13 weeks. Equation:? Total amount of money after 13 weeks: $?
