Casio fx-991EX Classwiz Tips: Solving a Linear System
This week I am going to show some things that can be done with the Casio fx-991EX Classwiz.
Solving Linear Systems
The Classwiz can solve linear systems. To enter the Equation mode:
[MENU], [(-)] for A, 1 for Simul Equation
Up to four variables can be solved for.
One of the nice things of the Classwiz's Equation mode is that the equations as shown as it is written on paper.
For a 3 x 3 system (with coefficients reset to 0):
0x + 0y + 0z = 0
0x + 0y + 0z = 0
0x + 0y + 0z = 0
with a large left bracket symbol, {, to the left of the equations.
Entering negative numbers will change the plus to minuses: i.e. 5x - 6y instead of 5x + -6y.
Use the equals key [ = ] to enter coefficients and call for solutions.
Example:
- 2x + 11y + 3z = 25
3x + 6y - 8z = 9
10x + 2y + 9z = -3
x = -1231/1479 ≈ -0.8323191346
y = 3086/1479 ≈ 2.086544963
z = 63/493 ≈ 0.1277890467
Eddie
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