## Example Activity – Simultaneous Equation Solver

Use this activity to learn the basics of the App.

A small corporation borrowed \$500,000 to expand its product line. Some of the money was borrowed at 9% interest, some at 10%, and some at 12%. How much was borrowed at each rate if the annual interest was \$52,000 and the amount borrowed at 10% was 2.5 times the amount borrowed at 9%?

Let x = amount of money borrowed at 9%

y = amount of money borrowed at 10%

z = amount of money borrowed at 12%

 1 Write an equation for each of the statements:

x + y + z = 500,000

0.09x + 0.1y + 0.12z = 52,000

2.5x – y = 0

 2 Press Œ to display a list of applications on your calculator.

 3 Select PlySmlt2. The information screen displays.

 4 Press any key to continue. The MAIN MENU displays.

 5 Select Simultaneous Eqn Solver.

 6 Select 3 equations and 3 unknowns on the Simultaneous Equation Solver Mode screen. Press NEXT to continue.

 7 Enter the coefficients for the variables and the constants in the equation. Press [enter] after each entry to move the cursor to the next position.

 8 Select SOLVE ( s) to solve the system of equations. You see that the corporation borrowed \$100,000 at 9%, \$250,000 at 10%, and \$150,000 at 12%.