3-5-4

Modifying a Graph

Simultaneously Modifying Multiple Graphs by Changing Common Variables (Dynamic Modify)

Use the procedure below to change the values of up to two common variables used in multiple functions to simultaneously modify the graphs.

uTo modify multiple graphs simultaneously

Example: To graph the functions y = ax2 – b and y = ax + b, and then find out how a change in variable a from 1 to 4 and a change in variable b from –2 to 2 affect the shape and position of each graph

(1)On the application menu, tap T.

(2)Tap Oand then Jto display the Main application window.

Tip

• For details about using the Main application, see Chapter 2.

(3)Use the Main application work area to assign values to variables “a” and “b” (a = 1 and b = 2 in this example).

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(4)Tap Oand then [Close] to close the Main application window.

(5)Configure View Window parameters.

(6)On the Graph Editor window, input ax2 – b in line y1, and ax + b in line y2.

(7)Tap $ to draw the graph.

(8)Tap aand then [Graph Controller]. This displays the Graph Controller dialog box.

(9)Configure the following settings on the Graph Controller dialog box.

Setting

Description

Dynamic ]': a

Specifies a variable whose value is changed when you press the left

 

or right cursor key, or tap the left or right graph controller arrow.

Start: 1

These items specify the upper limit (End) and lower limit (Start) of

End: 4

the range of change of the Dynamic ]'value.

 

Use this setting to specify the increment of change in the Dynamic

Step: 1

]'value when you press the left or right cursor key, or tap the left

 

or right graph controller arrow.

 

 

 

Specifies another variable whose value is changed when you press

Dynamic `$: b

the up or down cursor key, or tap the up or down graph controller

 

arrow.

 

 

Start: –2

These items specify the upper limit (End) and lower limit (Start) of

End: 2

the range of change of the Dynamic `$value.

 

Use this setting to specify the increment of change in the Dynamic

Step: 1

`$value when you press the up or down cursor key, or tap the up

 

or down graph controller arrow.

 

 

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