Set up a system of linear equations to represent the scenario. Solve the system by using Gaussian elimination or Gauss-Jordan elimination. Slyvia invested in a total of $18,500. She invested part of the money in a certificate of deposit (CD) that earns 4% simple interest per year. She invested in a stock that returns the equivalent of 9% simple interest, and she invested it in a bond fund that returns 3%. She invested four times as much in the stock as she did in the CD, and earned a total of $1140 at the end of 1 year. How much principle did she put in each investment?
Sylvia invested $ in the CD, $ in the stock, and $ in the bond fund.