Formulate but do not solve the problem. Kelly Fisher invested a total of $20,000 in two municipal bonds that have yields of 8% and 10% interest per year, respectively. If the interest Kelly receives from the bonds in a year is $1720, how much did she invest in each bond? (Let x and y denote the amount, in dollars, invested at 8% and 10%, respectively.)         = 20,000         = 1720

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