Casio SERIES FX-9860G - Manual (Page 256)

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k Freehand Drawing
Description
You can use the pen option for freehand drawing in a graph.
Set Up
1. Draw the graph.
Execution
2. Press !4(SKTCH)6(g)6(g)1(PEN), and a pointer appears in the center of
the screen.
3. Use the cursor keys to move the pointer to the point from which you want to start
drawing, and then press w.
4. Use the cursor keys to move the pointer. A line is drawn wherever you move the pointer.
To stop the line, press w.
Repeat step 3 and 4 to draw other lines.
5-10-5
Changing the Appearance of a Graph