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Step & Key Operation Display
EL-9900 Graphing Calculator
Notes
The solver feature will graph
the left side of the equation
(volume, y = 30), then the right
side of the equation (y = 10r
2
),
and finally will calculate the
intersection of the two graphs
to find the solution.
The radius is 0.98 in.
The graphic solver will prompt
with a variable range for solv-
ing.
5-2
Set the variable range from 0 to 2.
1-5
1-6
Solve.
(
)
Save this formula.
Give the formula the name “V CYL”.
2
3-1
One very useful feature of the calculator is its ability to store and recall equations.
The solution from various values for known variables can be easily obtained by
recalling an equation which has been stored and giving values to the known
variables. The Graphic method gives a visual solution by drawing a graph.
Use the larger of the values to
be safe.
r
=1 ➞ r
2
= 1
2
= 1 <3
r
=2 ➞ r
2
= 2
2
= 4 >3
Recall the formula.
Enter the values: V = 200, H = 15.
Solve the radius setting the variable
range from 0 to 4.
Use 4, the larger of the values,
to be safe.
The answer is : r = 2.06
r
= 3 ➞ r
2
= 3
2
= 9 < 14
r
= 4 ➞ r
2
= 4
2
= 16 > 14
r
2
= = < 14
3-2
ENTER
0
ENTER
2
2nd F EXE
CL
2nd F
SOLVER
ENTER
L
ENTER
C
C
VY
2nd F
SOLVER
B01
0020
ENTER ENTER ENTER
ENTER
15
2nd F EXE
SPACE
04
ENTER
ENTER 2nd F EXE
r
2
= = <3
10
π
30
π
3
15
π
200
π
14