Overlaying graphs of functions on the Ti 89 titanium

[davetheant]

Hello everyone. I was wondering how to graph multiple functions of different types at the same time (ie a rectangular function on top of a parametric equation). Is this possible? Thanks.

[mellamokb]

Hi davetheant,

I don't know of a way to show graphs from multiple graphing modes at the same time on the TI-89. However, you could try some workarounds.

For instance, you could try saving an image of each of the graphs, and loading the images on top of each other.

1. Do first graph(s)
2. StoPic graph1
3. Do second graph(s)
4. StoPic graph2
5. RclPic graph1

That would show the two graphs overlaid on each other, if you are just interested in seeing what the results looked like. However, you cannot trace across both at the same time or find intersection points, etc.

You can also draws graphs manually in different modes using the catalog functions DrawFunc(), DrawParm(), DrawPol(), etc. You could load your series of graphs into a program, then run the program to view all of the graphs drawn together.

If you are wanting to draw the graphs overlaid so you can find, e.g., intersection points, you can do that from the home screen with the help of the Solve() function by combining your functions with "and":

Solve(y=3x+5 and 3x+4y^2=5 and cos(x)^2+sin(y)^2=1,{x,y})

Hope this helps!

Regards,
~ mellamokb