a state government borrows $2,000,000 at simple annual interest. some of the money is borrowed at 6%, some at 7.5%, and some at 8.5%. use a system of linear equations to determine how much (in dollars) is borrowed at each rate given that the total annual interest is $141,250 and the amount borrowed at 7.5% is four times the amount borrowed at 8.5%. solve the system of linear equations using matrices. at 6% $ at 7.5% $ at 8.5% $