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EL-9900 Graphing Calculator
There may be differences in the results of calculations and graph plotting depending on the setting.
Return all settings to the default value and delete all data.
As the Solver feature is only available on the Advanced keyboard, this section does not apply to the
Basic keyboard.
5-1
Solving a Literal Equation Using the Equation Method
(Amortization)
The Solver mode is used to solve one unknown variable by inputting known variables, by
three methods: Equation, Newton’s, and Graphic. The Equation method is used when an
exact solution can be found by simple substitution.
1. Find the monthly payment on a $15,000 car loan, made at 9% interest over four
years (48 months) using the Equation method.
2. Save the formula as “AMORT”.
3. Find amount of loan possible at 7% interest over 60 months with a $300
payment, using the saved formula.
Solve an amortization formula. The solution from various values for known variables
can be easily found by giving values to the known variables using the Equation
method in the Solver mode.
The formula : P = L
Example
1-3
Enter the amortization formula.
Select the Equation method for
solving.
1-1
1-2
Access the Solver feature.
P= monthly payment
L= loan amount
I= interest rate
N=number of months
This screen will appear a few
seconds after “SOLVER” is dis-
played.
1-(1+ )
-N
-1
A
2nd F
SOLVER
2nd F
SOLVER
1
—
(
-
)
a
/b
+
(
1
I
1
1
2
a
b
I
12
1
(
)
)
ALPHA
ALPHA
N
ALPHA
a
/b
a
/b
a
b
(
-
)
ALPHA
2nd F
PL
=
I
12
I
12
Before
Starting
Notes
Step & Key Operation
Display
ALPHA