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EL-9900 Graphing Calculator
NotesStep & Key Operation Display
2-2
Enter y =
√
6 - x
2
+ 2x for Y1,
y = Y1 - 2 for Y2, and y = -Y1 -2 for
Y3.
Notice that if you enter
y =
√
6 - x
2
+ 2x - 2 for Y1
and y = - Y1 for Y2, you will
not get the graph of a circle
because the “±” does not go
with the “-2”.
2-3
"Turn off" Y1 so that it will not
graph.
Notice that “=” for Y1 is no
longer darkened. You now
have the top portion and the
bottom portion of the circle
in Y2 and Y3.
2-4
Adjust the screen so that the whole
graph is shown. Shift 2 units down-
wards.
12-2
Y= CL
6
(
-
)
+
—
VARS
ENTER
CL
ENTER
ENTER
ENTER
VARS
—
—
2
A
1
2
12
2nd F
√
Graphing circles can be performed easily on the calculator display.
X/
/T/n
X/
/T/n
2nd F
2nd F
(3 times)
WINDOW
—
2
ENTER
—
2
ENTER
ENTER
x
2
-1.3 < Y < 3.1
-5.1 < Y < 1.1
➝
GRAPH