Tracing Graphs
Press b51 to choose the Graph Trace option.
Notice the Trace icon in the top left
corner of the work area. This is typical of many of the options from the menus.
Press ¡ and ¢ to trace along the graph and see the coordinates of current points in the lower right corner. For intricate functions progress can be slow along the curve but you
can change the Trace Settings to increase the Trace Step: press b53 and try a step of 0.5 or 1. To start tracing at an integer value of x, in Graph Trace mode simply type the integer and press ·.
Press £ or ¤ to move to the other graph. To trace through all the visible functions at once use Trace All b52. Notice that significant points such as maxima, minima and zeros are automatically identified.
To stop tracing you need to press d. Check to see that the Trace icon is no longer showing in the top left corner.
Points and coordinates
Here is the way to mark points of intersection of two lines.
•Press b73 to choose the Intersection Point(s) option. Notice the icon has appeared in the top left corner.
•Move the cursor to the graph of f1(x). With the graph highlighted click x.
•Move to the graph of f2(x). With the graph highlighted click x.
Notice that the Intersection Points icon is still visible so you can go on to mark more intersections. For example you could try marking where the two graphs cross the
Now press d.
First Steps with
Tutorial 4: Graphing
Trace picks out significant points
The current value of the trace is displayed in the bottom corner
Points of intersection
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