Lesson 4
Part II (Introduction to Graph & Table, continued)
In this part, we will work with changing our graph windows view. Why? Well, sometimes we need to explore graphs at x-values or y-values that are not currently showing in our window. When this happens we can open the View Window dialog and change our graph scale.
We use the View Window to change our current graph window settings. As with the Table button, the View Window button is on both the Graph and Graph Editor toolbars. Just look for the 
button.
xmin - the smallest value showing on the x-axis.
xmax - the largest value showing on the x-axis.
ymin - the smallest value showing on the y-axis.
ymax - the largest value showing on the y-axis.
Scale - implies how often to place the tick marks on the axes.
Dot – has to do with pixel size. This value is pre-set for you.
1. Changing the x-Axis and Scale
2. Changing y-Axis Settings
3. Changing Window Settings – By Zooming
An easy way to change View Window settings is to zoom the window. Each time you zoom, the View Window settings change automatically. Remember, select Zoom/Quick Standard to return to a “normal” window.
Other things to try:
- You can shift the graph window by pressing the right, left, up or down arrows on your keyboard or cursor pad. Or, click the
button and then press in the Graph window and drag. - When the Graph window has focus, if you advance the toolbar by clicking the
button, you will find more options. The 
menu provides even more options.
Part II
Practice Exercises
- Please clear your Graph Editor window.
- Let y1 = x/(x-100) and press EXE.
- Graph y1. Change your xmin to 20 and xmax to 180 and click OK.
- When x=90, what does y1 equal? Set ymin = 90/(90-100)
- When x=110, what does y1 equal? Set ymax = 110/(110-100)
- Click OK.
- Get a screen capture and paste it into your Lesson4 document (under a title of PART II).
- Click the Resize button or press Ctrl+r to enlarge the graph window.
- Select Analysis/Trace. If xc=100 is not showing, type 100 and a dialog will automatically open. Set x-value to 100 and click OK.
- Get a screen capture. Add two blank spaces following the last screen capture and paste this one. Think about why x/(x-100) is undefined when x=100.
- Resize your window again to see the Graph Editor. Uncheck y1.
- Let y2=x^2 and press EXE.
- Graph y2 and then select Zoom/Quick x^2.
- Open the View Window; check both boxes for x-log and y-log. Next, change the other settings to match the following screen capture and then press OK. Notice your parabola is now a straight line!
- Get a screen capture, add two spaces following the second screen capture and paste this one.
- [Very Important!] Open the View Window dialog; uncheck x-log and y-log. NEXT, click the Default button and then click OK.