Question about Texas Instruments TI-84 Plus Calculator

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Selecting equations to graph

When Y1 is selected and I try to select Y2 then Y1 becomes deselected

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  • Anonymous Feb 02, 2009

    My L1 is missing



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Just try resetting your calc. Hit 2nd then + then 7 then 1 then 2

Posted on Feb 06, 2008


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Program to graph shaded heart

What are the question marks in the two equations? Get rid of them or replace them with numbers and you'll get rid of the error.

Apr 28, 2012 | Texas Instruments TI-83 Plus Graphing...

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What is the meaning of the error "invalid axes"?

This is problem with graphing differential equation. Invalid Axes error occurs if Axes=TIME or if t(time) is set as a CUSTOM axis. This is important to noticed: if Fields=DIRFLD you cannot plot a time axis. See captured image:


This graph represented differential system of equations y1'(x)=y2(x), y2'(x)=-y1(x) for initial conditions y1(0)=0, y2(0)=-1.Finally, x axes=y1(x) and y axes=y2(x)

Feb 08, 2012 | Texas Instruments TI-89 Calculator

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Why is it that when i insert 2 equations into the y1= and y2= spots, my calculator only graphs one of the equations?

In all probability, someone used the Transfrm Application before. The problem is that it lingers in memory and has to be unloaded from RAM.
To do so
  1. Press the APPS button.
  2. Scroll Up or down to reach the Transfrm APP.
  3. Select it and press ENTER.
  4. In the subsequent screen, press the number that corresponds to the UNINSTALL option.
  5. Validate the selection by pressing the ENTER button.
  6. Go back to your Y= Editor and enter up to 10 functions, then press the GRAPH key.
  7. Graphs should know display correctly.

May 31, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

I have a student in my Precalculus class who is trying to graph several equations simultaneously, and her calculator will only display the graph of one equation at a time. In the equation editor, the...

Some time or other she played with the Transfrm Application. It remains in memory and takes over the graphing capabilities of the native OS. It must be kicked out of memory.

  1. Press [APPS]
  2. Use Up or Down arrows (Up is faster) to get to the bottom of the APPS list.
  3. Locate [:Transfrm], highlight it and press [ENTER]
  4. In subsequent screen, select the [UNINSTALL] option.
  5. Go back to the [Y=] screen and enter or edit your functions.
  6. Press [GRAPH] when finished entering the functions.

Oct 07, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

How to get line of best fit

Once you enter your data [MENU][STAT], press [F1:Graph], select Gph1, Gph2, or Gph3. Once the graph of the experimental data is drawn, you will have access to the diverse regression models. Your choices are [X:Linear] [Med-Med], [Quadratic :X^2] [Cubic;X^3] [Quartic: X^2]. Press [F6] to scroll right to access the others: [Logarithmic:LOG], [Exponential :EXP], [Power :Pwr] and [Sinusoidal: Sin]
After you select a model and press [EXE], the screen displays the equation and its various coefficients. On that same screen, you have a menu option [F6:Draw]. If you select it, the regression curve will be drawn on the same screen as your statistical graph. This allows you to judge if the fit is good. If it is not, you have the option to choose another model.
The other option [F5:Copy] allows you to save the regression equation in the Y1, Y2, etc. variables.

Hope it helps.

Oct 02, 2009 | Casio FX-9750GPlus Calculator

1 Answer

How can I get my calculator to highlight more than one function, to graph a circle for example?


Suppose you want to draw the circle the equation of which is X^2+Y^2=4, a circle centered at the origin with radius 2.
When you isolate Y^2 and then extarct the squre root you obtain two solutions, call them Y1 and Y2
Y1=SQRT(4-X^2), Y2= -SQRT(4-X^2)
You press[Y=] and type in the right hand side of the equations above, one in Y1= and the other in Y2. Press [GRAPH].

Ih a graphic does not appear within the scree window adjust the window parameters ( [WINDOW]) or Press [ZOOM] and select ZoomIn, ZoomOut, ZoomSTD, etc.

Explore the program Draw accessible by pressing [2nd][DRAW].

Hope it helps

Sep 04, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

I can't find how to graph absolute value function.

Here how you do it taking as exemples y1=x^3 -5 and y2=abs(x^3-5)
Turn calculator ON by pressing [AC/On] . Use arrows to select [Graph] icon and press [EXE]
On line Y1= enter X[^]3 -5 [EXE]
On line Y2= press [OPTN] [F5:NUM][F1:abs] [(] X [^]3 -5 [)] [EXE]
The graphs will be drawn one after the other. You might have to adjust the window limits.
Here is an ouput drawn on another calculator.
For negative values of the x-variable, Y1 has negative values, while in the same range, Y2 has positive values, equal and opposite to those of Y1. In that range, Y1 and Y2 are symetric of each other with respect to the X axis.
For positive values of the x-variable, Y1 and Y2 are identical.

Hope it helps

Jan 30, 2009 | Casio CFX-9850G Plus Calculator

3 Answers

My calculator will only graph one graph at a time.

This is simple... Back up all RAM, (press second+, then 2, then 1, press enter to back up something if backed up it will have a star by it) Then clear your RAM (pull out your batteries while the calc is still on or press second+, then 7, then 1)
Hope this helps!

Oct 07, 2008 | Texas Instruments TI-84 Plus Calculator

2 Answers

Graphing multiply equations

When you go to Y=, you should get a list that says:
etc. You just enter the first equation into the Y1= space then hit ENTER and it will go to Y2=. Enter the second equation there. After you have entered all of your equations, push GRAPH and they should come up in order but they will all appear.

Also, make sure your window is set appropriately so that you are able to see all of the graphs.

Lastly, when you look at your Y= screen, are there funny looking arrows before the Y=? If so, do this:

  • Press [APPS] key
  • Select Transfrm from the menu
  • Press 1:Uninstall

  • Hope one of these are helpful!!


    Feb 18, 2008 | Texas Instruments TI-84 Plus Calculator

    6 Answers

    Can't select multiple equations to graph at the same time.

    On the TI-84 there is an application called Transfrm. When active it prevents you from graphing multiple functions at the same time. To fix this, select Transfrm fom the APPS menu (it was at the bottom of mine) and select 1:Uninstall. That should fix the issue

    Aug 31, 2007 | Texas Instruments TI-84 Plus Silver...

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