Casio fx-9860GII Instructions Manual page 7

Example 6
Solve the equations
Press MENU . You will see the dialog box as shown on the right.
Choose A: EQUA and press
From the menu, choose Simultaneous and press
Choose equations in three unknowns and press
You will see the template on the right.
Type the coeffi cients from the three equations into the template,
pressing EXE after each number.
F1
Press and the calculator will solve the equations,
giving the solutions as X, Y and Z.
The GDC solves the equations by an inverse matrix method.
In this example there is an error because the matrix is singular,
which means that there will be no unique solution.
To fi nd the solution you can use the reduced row echelon form
method instead.
Press MENU 1
Press | F2 MAT |
OPTN
Press EXIT EXIT | F4 MATH |
Choose m as 3 and n as 4 and press
© Oxford University Press 2012: this may be reproduced for class use solely for the purchaser's institute
2x + 4y + 2z = 8
x + 2y + z = 4
3x − y + z = −9
EXE .
If there are previous
equations in the memory,
press
to this menu.
The equations must be in
the correct order.
F5
| Rref
F6
F1
MAT | F3
EXE .
F1
.
EXIT
until you return
.
F2
m × n
Casio fx-9860GII
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Continued on next page
Using a graphic display calculator 7