Alan is putting money into a savings account. He starts with $550 in the savings account, and each week he adds $40. Let S represent the total amount of money in the savings account (in dollars), and let W represent the number of weeks Alan has been adding money. Compose an equation relating S to W. Then use this equation to find the total amount of money in the savings account after 19 weeks.
Equation: S = 550 + 40W
Total amount of money after 19 weeks: $1,330