Insertion procedure with the calculator

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Do you want to solve a system of linear equations with a calculator? Then you can use the appointment procedure. A pocket calculator that makes this easy is the Casio FX-991ES.

This will take you to the mode for calculating systems of linear equations with a pocket calculator

To solve a system of linear equations, you have the option of using the calculator Casio FX-991ES to use.

  1. First of all, you need to put yourself into the mode provided for this.
  2. To do this, switch on the Casio FX-991ES and press the "Mode button", which is located to the left of the "On button".
  3. Next, press the "5" or "EQN" key.
  4. You now have the option of solving a 2x2 or a 3x3 system of equations. So either an equation with two or three unknowns. To do this, press the "1" or "2" key.
    5. Set up a straight line equation - this is how it works

    Sooner or later you will set up straight line equations in math class ...

Other pocket calculators that you can use to solve systems of equations include the "TI-84 Plus graphic calculator" from Texas Instruments and the "Scientific Calculator (HP 35s)" from Hewlett Packard “.

How to use the appointment procedure with an example

The easiest way to explain the installation process is with an example. You have three unknowns and three Equations. The first equation is x1 -x2 + x3 = 0, the second equation is -2 x1 + x2 -3 x3 = 0, and the last equation is x1 - x3 = 3.

  1. First, enter the mode as described above to solve a 3x3 equation. So first select the "Mode button" one after the other, then the "5" and then the "2".
  2. Next, enter the three equations. To enter the first equation, first press "1", then "-1", then again "1" and finally "0". Use the "=" key to move forward one field.
  3. Do the same for the other two equations. Since no "x2" is given in the third equation, you have to give this "space" a "0".
  4. After you have entered all values ​​in the "matrix" on your calculator, press the "=" key again.
  5. You will then receive the value for "x1", in this example it is "2". If you now press the "arrow key" below the display downwards, you will get the value "x2 = 1" and, if you press it again, the value for "x3 = -1".

You can plug the results into an equation to check the values. The result for the first equation would be: 2 - 1 - 1 = 0.

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