Sharp EL-5230, Operation Manual

Page: 71 / 132

69
Chapter 5
Equation Solvers
Simultaneous Linear Equations
Simultaneous linear equations with two unknowns (2-VLE) or with three
unknowns (3-VLE) may be solved using this function.
1 2-VLE:
b 3 0
2
3-VLE:
b 3 1
• If the determinant D = 0, an error occurs.
• If the absolute value of an intermediate result or calculation result is equal
to or greater than 1
×
10 100 , an error occurs.
• The results obtained by this function may include a margin of error.
Example 1
2 x +3 y = 4 x = ?
5 x +6 y = 7
Ò
y = ?
det(D) = ?
1. Press
b 3 0
to select 2-
VLE of the EQN mode.
2. Enter the value of each coefficient
(a1, etc.)
2
e
3
e
4
e
5
e
6
e
7
• Coefficients can be entered using ordinary arithmetic operations.
• To clear the entered coefficients, press
j
.
• Press
d
or
u
to move line by line. Press
@ d
or
@
u
to jump to the last or top line.
a⁄z 0.
b⁄ 0.
c⁄ 0.
a
1
x + b
1
y = c
1
a
2
x + b
2
y = c
2
a
1
b
1
a
2
b
2
D =
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
a
1
b
1
c
1
a
2
b
2
c
2
a
3
b
3
c
3
D =