Question about Texas Instruments TI-84 Plus Calculator

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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 symbol on the far left in front of Y1 is not the backslash that is usually there. I can't find any indication that she is in a different mode, so I can't help her. I have tried resetting the default, but I still get the unusual symbol in front of each equation (Y1, Y2, Y3, ...) The symbol looks almost like an hourglass on its side. Any suggestions? Cathy Muller, Math faculty, BMCC, Pendleton, Oregon

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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.

Posted on Oct 07, 2010

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How do you find the equation of a exponential graph


Usually ypu know the equation then graph it. However in doing statistics, it may appear that the curve of best for a scatter plot could be could an exponential. In that case you use the STAT application to enter the x-data in List 1 and the y-data in List 2. When you finish press the f1 key to select Graph1. You should also verify by Pressing F6:set that the graph type is set to scatter, and that List 1 contains the x-data and List 2, the y-data. After you verify that all is in order press the F1: Graph 1 key.
As the graph is displayed you will see several tabs with various regression models. Pan thr tabs to the right to get to F2:EXP. Select it.
The equation is displayed on the next screen. At the bottom of the screen you see two tabs COPY and DRAW. Press f5:Copy to copy the equation in one of the y= functions.
Press Draw and you will see the curve of best fit superposed on the scatter plot points.

Aug 23, 2011 | Casio FX-9750GPlus Calculator

1 Answer

In my precal class we are studying trigonometry graphing. On my calculator I made 3 lists L1, L2, and L3 when I go to graph and regulate the equation it only regulates the equation for both L1 and L2....


I do not know what you mean by regulate, but if you want to perform a regression analysis using data from L1 and L3, all you have to do is to specify the lists to be used.
For example if you have to perform QuadReg on L1,L3,
  1. Press [STAT] button,
  2. then Right Arrow to select CALC(ulate)
  3. then [5:QuadReg]
  4. The command QuadReg echoes on main screen as QuadReg .
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Feb 04, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

Several of my students using TI-84 plus calculators cannot get them to graph more than one equation simultaneously. We've tried highlighting the = signs, but when one is highlighted, the others are not. ...


OK. There is an application installed in the calculator called Transfrm. Once you run it, it takes over graphing capabilities from the native OS, and stays in memory. You must unload it from RAM.
To do so
  1. Press the [APPS] key
  2. Select [:Transfrm] and press [ENTER].
  3. The new screen invites you to Uninstall Tranfrm or to continue.
  4. Select the number the corresponds to Uninstall
  5. Validate as required.
  6. Once the APP is kicked out of memory you will be able to graph UP to 10 functions.

Sep 20, 2010 | Texas Instruments TI-84 Plus Calculator

2 Answers

How do I clear things left in the stat plot window?


To clean the slate so to speak, just reset the RAM.
  1. Press [2nd][+] to access the (MEM)ory management function
  2. Press [7:Reset]
  3. Press [1:All Ram]
  4. Press [2:Reset]
  5. Press [CLEAR] to erase the "RAM cleared" Message

Calc

Aug 02, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

I can not graph simultaneous equations. Mode is set to functions and simutaneous. Megaphone(?) is to the left of y= instead of \ (or /). I can do this on other TI 84s but not my own!!


Hi,
What you call a megaphone is a bit of graph style that the calculator can use to display graphs. There are 7 styles. To select a style, open the Y= editor. On the same line where you typed in an equation, use the left arrow to move the cursor on the graph style piece. Highlight and press ENTER. Each time you press ENTER, the style changes, so you can cycle through all the available ones. Be careful with the bubble style, it will not leave a graph. It will evaporate.

Whether you draw the graphs simultaneously or sequentially amounts to the same thing at the end. Both graphs will be present on the same sceen (except the bubble).

What you should make sure of is that the equal signs of both functions (Y1=, and Y2=) remain highlighted as cursor moves to another location. Usually, an equal sign becomes highlighted as soon as you start enbtering the relevant function. If you cannot keep both highlighted, I suggest you reset the calculator RAM.

To reset Ram
Press [2nd][MEM][7:Reset][1:All Ram][2:Reset][ENTER] . Press [CLEAR] to clear the "Ram Cleared" message.

If for some reason you do not want to clear the Ram, you must turn statplots of.
To turn StatPlots Off

Press [2nd] [Y=] (STATPLOT). Select [4:PoltsOff][ENTER][ENTER].

That should work.

Hope it helps.
Don't forget to rate the solution and don't be stingy: 4 thumbs up won't leave you any the poorer.

Nov 25, 2009 | Texas Instruments TI-84 Plus Calculator

2 Answers

We are graphing more than one line at a time. One


To return your calculator's graphing equation to "Y=", press "MODE" from the home screen, then ensure that the option on the fourth row is set to "Func". Next, to show a hidden graph, access the Y= list, then press the left arrow key until the cursor is over the "=". Press "ENTER" to toggle visibility of that line.

Nov 13, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

My TI--84 plus calculator won't display the 7 graph modes, and it won't graph equations simultaneously. What is wrong? I can only get an arrow icon and an arrow-bar icon.


Hello,
Use the [Y=] entry screen to enter the functions you want to graph. Make sure that the = sign after Y1, Y2 etc. is highlighted (black). If the = sign is not highlighted the corresponding function will not be drawn. You can can up to 10 functions, but what is the point of drawing so many if they overlap?
Anyway, to change the graph style of the curve for a particular function, use arrows to move to the line, then use left arrow to the bit of line that appears to the left of the Y. Highlight the segment an press ENTER. Each time you press ENTER the style changes to another one. Beware of the unconnected bubble style. During the drawing it will show the position of the point being drawn, but at the end, the whole curve, so to speak, evaporates.
As to simultaneous graphs, if it is important to you to have the graphs drawn for all the curves at the same time, you can enforce that by pressing [MODE], and using down arrow to reach the 6th line Sequential Simul. Use the right arrow to highlight Simul and press ENTER.
Whether drawn sequentially or simultaneously, all graphs will be displayed, except for the ones with the unconnected bubble as style.

Hope it helps.

Oct 02, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

I can't see two graphics simultaneously.I write Y1= (something) and then i write another function Y2= (something). But when I click "enter" in the = sign of the second function, the black spot jumps to the...


To view both graphs, the = signs on both y1 and y2 must be contained in black boxes. If you put your cursor over the = sign on the second equation and hit enter, it turns that graph off and you won't be able to see anything but the equation in y1 line. If there is not black box around the = sign of any equation in any of the lines you have typed an equation into, you will not see the graph.

Aug 12, 2009 | Texas Instruments TI-84 Plus Calculator

2 Answers

Graphing


The first solution will allow you to watch your calculator graph two equations simultaneously rather than finishing one before graphing the next; it won't solve the problem of having the calculator unselect one equation when you select a second. To fix that problem, try the following:


In order to select additional graphs, the Transformation Graphing App will need to be uninstalled from the TI-83 Plus Family and TI-84 Plus Family. Uninstalling the App does not erase it from the calculator, it disables it from interfering with the normal graphing modes. Below are the steps to successfully uninstall the App.
  • Press [APPS] key
  • Select Transfrm from the menu
  • Press 1:Uninstall
The illustration and solution are courtesy of Jesse Phillips, who cites this page from the Texas Instruments support site

- doug garfinkel, Children's Day School

Jan 15, 2008 | Texas Instruments TI-84 Plus Silver...

2 Answers

Graphing inequalities


While the graph function menu is on the display press the F3 button to display the graph you want to do. Then press the function key that corresponds to the graph that you want. If you have the manual it explains it on page 117. Kind of hard to explain it here when you can't type the buttons. LOL

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