Casio FX-9750GII - Manual (Page 103)

4-1
Chapter 4
Equation Calculations
From the Main Menu, enter the EQUA mode.
• {SIML} ... {linear equation with 2 to 6 unknowns}
• {POLY} ... {degree 2 to 6 equation}
• {SOLV} ... {solve calculation}
1. Simultaneous Linear Equations
You can solve simultaneous linear equations with two to six unknowns.
• Simultaneous Linear Equation with Two Unknowns:
a
1
x + b
1
y = c
1
a
2
x + b
2
y = c
2
• Simultaneous Linear Equation with Three Unknowns:
a
1
x + b
1
y + c
1
z = d
1
a
2
x + b
2
y + c
2
z = d
2
a
3
x + b
3
y + c
3
z = d
3
…
1. From the Main Menu, enter the EQUA mode.
2. Select the SIML (Simultaneous) mode, and specify the number of unknowns (variables).
You can specify from 2 to 6 unknowns.
3. Sequentially input the coefficients.
• The cell that is currently selected for input is highlighted. Each time you input a coefficient,
the highlighting shifts in the sequence:
a
1
m b
1
m c
1
m … a n m b n m c n m ( n = 2 to 6)
• You can also input fractions and values assigned to variables as coefficients.
• You can cancel the value you are inputting for the current coefficient by pressing ) at
any time before you press U to store the coefficient value. This returns to the coefficient
to what it was before you input anything. You can then input another value if you want.
• To change the value of a coefficient that you already stored by pressing U, move the
cursor to the coefficient you want to edit. Next, input the value you want to change to.
• Pressing (CLR) clears all coefficients to zero.
4. Solve the equations.
Example To solve the following simultaneous linear equations for x , y , and z
4 x + y – 2 z = – 1
x + 6 y + 3 z = 1
– 5 x + 4 y + z = – 7
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