EL-9600/9400 Graphing Calculator
Notes
Step & Key Operation
(When using EL-9600)
*Use either pen touch or cursor to operate.
Display
(When using EL-9600)
Slope and Intercept of Linear Equations
A linear equation of
y
in terms of
x
can be expressed by the slope-intercept form
y = mx+b
,
where
m
is the slope and
b
is the
y
- intercept. We call this equation a linear equation since its
graph is a straight line. Equations where the exponents on the
x
and
y
are 1 (implied) are
considered linear equations. In graphing linear equations on the calculator, we will let the
x
variable be represented by the horizontal axis and let
y
be represented by the vertical axis.
The equation Y1 =
x
is dis-
played first, followed by the
equation Y2 = 2
x
. Notice how
Y2 becomes steeper or climbs
faster. Increase the size of the
slope (
m
>1) to make the line
steeper.
1.
Graph the equations
y = x
and
y =
2
x
.
2.
Graph the equations
y = x
and
y = x
.
3.
Graph the equations
y = x
and
y = - x
.
4.
Graph the equations
y = x
and
y = x +
2.
Enter the equation
y = x
for Y1
and
y =
2
x
for Y2.
View both graphs.
1
-
1
Draw graphs of two equations by changing the slope or the
y-
intercept.
1
-
2
Example
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
*
*
Enter the equation
y = x
for Y2.
View both graphs.
Notice how Y2 becomes less
steep or climbs slower. De-
crease the size of the slope
(0<
m
<1) to make the line less
steep.
2
-
1
2
-
2
There may be differences in the results of calculations and graph plotting depending on the setting.
Return all settings to the default value or to delete all data.
Before
Start
1-1
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
2
1
2
1
*
Y=
ENTER
2
Y=
CL
1
a/b
2
GRAPH
GRAPH
X
/
/
T
/
n
X
/
/
T
/
n
X
/
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HB1.DocA.
98.10.1, 10:28 AM
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