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2
Advanced Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
Steps for solving an equation using the equation method
1. Turn the calculator on and press 2ndF SOLVER to access the solver
feature. A blank screen should appear. If the screen is not blank, then press
CL to clear the screen.
2. Select the Equation method for solving by pressing 2ndF SOLVER ,
A (METHOD) 1 (Equation).
3. Enter the formula P = L 1 – ( 1 + I
÷
12)
–
N
-
1
I÷12
Press ALPHA P ALPHA = ALPHA L
(
a/b 1 –
(
1
+ ALPHA I ÷ 1 2
)
a
b
(-)
ALPHA N
ALPHA I ÷ 1 2
)
a
b
(-)
1 .
This equation is referred to as the amortization formula, with a loan ( L) with
a fixed rate of interest (I ).
4. Press ENTER to view the variable list. To find the monthly payment on
a $15,000 car loan made at 9% interest over four years (48 months), enter
the values by pressing ▼ 1 5 0 0 0 ENTER • 0 9
ENTER 4 8 ENTER . Press and notice the payment ( P)
is now highlighted by the cursor, press 2ndF EXE to solve for the
payment.
5. Pressing CL will return you to the variable screen. You can now change
or solve for any of the values. Save this formula by pressing 2ndF
SOLVER C (SAVE) ENTER and entering the formula name. Give the
formula the name AMORT by pressing A M O R T ENTER .
FORMULAS OR LITERAL EQUATIONS
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