Sharp EL-5230 - Manual (Page 71)

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
2x+3y = 4 x = ?
5x+6y = 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 =