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 … an m bn m cn 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
4x + y –2z =– 1
x +6y +3z = 1
– 5
x +4y + z =– 7
4
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