Last year Tammy had $4,500 to invest in two savings accounts. One account earns 7% simple annual interest, and the other account earns 4% simple annual interest. At the end of the year, Tammy had earned a total of $240 in interest from the two savings accounts.
Part A Write a system of two equations that could be used to find the amount of money invested in each account. Let x represent the amount invested at 7%, and let y represent the amount invested at 4%.
Part B Solve the system of equations. How much did Tammy have invested at each rate?

Question

Last year Tammy had $4,500 to invest in two savings accounts. One account earns 7% simple annual interest, and the other account earns 4% simple annual interest. At the end of the year, Tammy had earned a total of $240 in interest from the two savings accounts.
Part A  Write a system of two equations that could be used to find the amount of money invested in each account. Let x represent the amount invested at 7%, and let y represent the amount invested at 4%.
Part B  Solve the system of equations. How much did Tammy have invested at each rate?