LEXIBOOK GC500i Instruction Manual page 43

Example: To use the Trace function in combination with the Zoom function to analyze the
graph for y=x -3. Use the following range parameters for the original graph (seven significant
2
digits specified).
Xmin : -4
Xmax : 4
Xscl : 2
After specifying the range parameters, graph y=x
SHIFT Cls EXE
Graph
ALPHA X x
Activate the Trace function
Trace
Use or to move the pointer along the graph. Each press moves the cursor one point.
Move the pointer to the point where the graph intersects the x-axis and press
x-coordinate value.
SHIFT
Press to change the coordinate display to show the y-coordinate.
SHIFT X↔Y
SHIFT
Now use the Zoom function to enlarge the graph. First specify a factor of 2 on the x- and y-axes.
SHIFT Factor
2
SHIFT Factor
*** Whenever you try to change the factor value while a graph is displayed, the display changes to the text
screen automatically. To return to the graph screen after changing the factor value, press
Now enlarge the graph according to the factors.
SHIFT
Activate the Trace function and move the pointer again.
Trace
Copyright L 2002
EXIBOOK
Ymin : -8
Ymax : 8
Yscl : 4
-3.
2
3
-
2 EXE
Value
X↔Y
EXE
EXE
Zoom xf
SHIFT X↔Y
to display
SHIFT Value
- 1.647058824
- 0.287197231
Xfact?
1.5
Yfact?
2.
Xfact?
2.
SHIFT Factor
- 43 -
GB
.