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 9% interest per year, respectively. if the interest kelly receives from the bonds in a year is $1680, how much did she invest in each bond? (let x and y denote the amount, in dollars, invested at 8% and 9%, respectively.)
= 20,000 = 1680

Look at this system of equations. -3x + 3y = 12 y = x + 4 the solution set of this system is best explained by which of these statements? a) the graphs of the equations are the same line because the equations have the same slope and the same y-intercept. the system has infinitely many solutions. b) the graphs of the equations are parallel lines because they have the same slope but different y-intercepts. the system has no solution. c) the graphs of the equations are lines that intersect at one point because the equations have the same slope but different y-intercepts. the system has exactly one solution. d) the graphs of the equations are lines that intersect at one point because the equations have the same slope and the same y-intercept. the system has exactly one solution.