Question about Texas Instruments TI-84 Plus Calculator

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Every time that I put in a function such as Y1=(square root symbol)100-x^2) Y2= -Y1 and both functions are highlighted at the equal signs, but after I hit trace it will only do Y1. I have experimented and my TI 84 will not do more than 1 function at a time. This is relly going to hurt me at Algebra 2, and even my math teacher tech wiz has absolutly no idea whats wrong manuel was no help either. Can you help?

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Hello,
You can draw several graphs on the same screen and use the TRACE function to move the cursor along a curve and read the values of the x-y coordinates. To move cursor along the same curve you use the left and right arrow keys.
But to jump from one curve to another curve, you use the Up and down arrows. Each time you press the Up or down arrow cursor jumps from the current curve being traced to the next one as they were entered in Y= editor.

Posted on Nov 11, 2010

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My calc can only display one function on the graph part at a time, and has a strange icon beside the Y1 ,Y2,...etc it looks like an arrow. How do i get it back to normal?


At some time or other you executed the Transfrm Application. I remains in ram and takes over the graphing duties from the native OS. You must unload it from memory. Do not worry this will not delete it.
To unload it from RAM
  1. Press the APPS button.
  2. In the list of APPS look for Transfm. You will have to scroll down or Up (faster) to get to it.
  3. Select it and press [ENTER]
  4. A new screen is displayed inviting you to Uninstall or Continue.
  5. Press the number key corresponding to Uninstall.
Return to the [Y=] function editor to type in the functions to graph. Make sure that the = signs after the Y1,Y2, are highlighted. If one of them is not highlighted, move cursor on = and press ENTER

Sep 16, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

I cant highlight both equations in Y= to graph


Hello,

First thing to do before any new type of problem
1. Turn StatPlots OFF : press [2nd][STATPLOT][4:PlotsOff] [ENTER]

Second thing: Clear the statistical lists
2. Press [2nd][0][PGRM] DownArrow to point to ClrAllLists.
3.Press [ENTER][ENTER]

Third thing : Configure the graph type to be FUNCTION graph
4. Press [MODE]. If FUNC (on fourth line) is highlighted. Press [Y=] and start entering the functions.
5. If FUNC is not highlighted, use Down arrow till 4th line, highlight FUNC and press [ENTER]. Press Press [Y=] and start entering the functions.

Fourth thing: Enter function and select them for graphing
1. As you start entering the function Y1=, notice that the = sign becomes highlighted. Press [ENTER] when Y1 is typed in. Make sure the = sign for Y1 remains highlighted as cursor moves to Y2=.
2. Keep entering the functions and verifying that their = signs remain highlighted as cursor moves to another equation.
3. When finished press [ENTER]
4. Look at the graph style for each function: it is a bit of line to the left of each Y. Here is a picture of all the 7 styles.

5d53e23.jpg

To set a graph style, highlight the style to the left of the Y, and press [ENTER]. Each time you press [ENTER] you see a new style, in the order shown on picture.
Avoid the style of Y6, it is bubble, and as such will burst and disappear once graph is finished. Avoid also the triangular ones (for Y3 and Y4) they will shade areas of the graph, and may hide other functions.

Fifth thing: Graph Functions.
1. You can press [GRAPH] to see your graphs.
2. If one curve is missing (and you have not set its style to be rhe bubble), it may be due to the Window dimensions.

Sixth Thing: Set Window dimensions and Zoom.
1. Press [ZOOM][6:ZStandard] to use standard window dimensions.
2. If curve still missing, Press [ZOOM][3:Zoom Out] to zoom out so that you may be able to see a bigger range for the functions.
3. If necessary press [WINDOW] and set the Xmin, Xmax, Ymin,Ymax to values of your own.

d44f2dd.jpg

Dimensions must obey the conditions: Xmin < Xmax, and Ymin < Ymax.

Hope that helps.

Nov 09, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

Graphing function will only graph one equation at a time. Why is this and how can I fix it? Thanks!


Hello,
  1. Once you enter an equation, the corresponding equal sign is highlighted by default.
  2. Before you draw the 2 graphs, move the cursor to Y3 or Y4 and verify that the = signs for Y1 and Y2 remain highlighted.
  3. If one is not highlighted, move the cursor on it and press ENTER.
  4. If you still have problem, press [2nd][STATPLOTS][4: PlotsOff] [ENTER].
  5. Command PlotsOff echoes on main screen.
  6. Press [ENTER], screen displays Done.
  7. Restart the graphing procedure.
  8. If all else fails, just reset the RAM by pressing [2nd][MEM][7:Reset][1:All RAM][2:Reset], press [CLEAR] to clear the message.
You shouild make it a habit to clear the RAM every time you start a new type of problem.

Hope it helps.

Nov 05, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

My graphing calculator only allows me to graph one line at a time


Hello,
Once you enter an equation the corresponding equal sign is highlighted by default. Before you draw the 2 graphs, move the cursor to Y3 or Y4 and verify that the = signs for Y1 and Y2 remain highlighted. If one is not highlighted, move the cursor on it and press ENTER.

Once all the = signs for all the functions ypu want to draw are highlighted permanently, press the [GRAPH] key.
Depending on the functions ane the window dimensions certain graphs may not show up and one can Zoom out or adjust the window.

If you still have problem, press [2nd][STATPLOTS][4: PlotsOff] [ENTER]
Command PlotsOff echoes on main screen. Press [ENTER], screen displays Done.

If all else fails, just reset the RAM by pressing [2nd][MEM][7:Reset][1:All RAM][2:Reset], press [CLEAR] to clear the message.
You shouild make it a habit to clear the RAM every time you start a new type of problem.

Hope it helps.

Oct 19, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

Trying to graph polynomial equation and err:invalid dim comes up


Hello,
Before starting to graph Y= function, you should Turn STATPLOTS off.
Press [2nd][STATPLOTS] [4:PlotsOff]. command echoes ob screen as PlotsOff . Press [ENTER] to execute it. Calc answers Done.
Press [MODE]
See if Func, (4th line) is already highlighted.
If it is press Y= to start entering the functions.
If it is not highlighted, scroll down to 4th line, then use arrow to highlight Func an press ENTER.

Then press Y= and enter the function. You see that as you enter the function the equal sign becomes highlighted white on dark. Finish entering the sunction and press ENTER. Cursor move to Y=2. Make sure that the equal sign for Y1= is still highlighted. If not, move the cursor on it and press [ENTER].

You can enter the variable X by pressing the [X,T,theta,,n] button to the right of the green [ALPHA] key. Or, alternatively, you press [ALPHA] [STO->] (X).

To graph Press [GRAPH]. If you do not see anything on screen, it may be due to the window dimensions. You can modify the window by pressing the [WINDOW] button.

To test you configuration, I suggest you graph Y1=e^(x) and Y2= ln(x)
e9fbf22.jpg

You access the exponential e by [2ND] [LN] (e^x) and the natural log by pressing [LN]. In each case you have to enter the right parenthesis.
This what you should get.
d4c87a8.jpg
If you are not familiar with these function, just enter Y1=X and you will see a staright line passing through the origin (0, 0), just like the one on the following screen capture.


2aeab91.jpg
Hope it helps.

Oct 17, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

Trying to use graph function but nothing comes up on screen


Hello,
Before starting to graph Y= function, you should Turn STATPLOTS off.
Press [2nd][STATPLOTS] [4:PlotsOff]. command echoes ob screen as PlotsOff . Press [ENTER] to execute it. Calc answers Done.
Press [MODE]
See if Func, (4th line) is already highlighted.
If it is press Y= to start entering the functions.
If it is not highlighted, scroll down to 4th line, then use arrow to highlight Func an press ENTER.

Then press Y= and enter the function. You see that as you enter the function the equal sign becomes highlighted white on dark. Finish entering the sunction and press ENTER. Cursor move to Y=2. Make sure that the equal sign for Y1= is still highlighted. If not, move the cursor on it and press [ENTER].

You can enter the variable X by pressing the [X,T,theta,,n] button to the right of the green [ALPHA] key. Or, alternatively, you press [ALPHA] [STO->] (X).

To graph Press [GRAPH]. If you do not see anything on screen, it may be due to the window dimensions. You can modify the window by pressing the [WINDOW] button.

To test you configuration, I suggest you graph Y1=e^(x) and Y2= ln(x)
e9fbf22.jpg

You access the exponential e by [2ND] [LN] (e^x) and the natural log by pressing [LN]. In each case you have to enter the right parenthesis.
This what you should get.
d4c87a8.jpg
If you are not familiar with these function, just enter Y1=X and you will see a staright line passing through the origin (0, 0), just like the one on the following screen capture.


2aeab91.jpg
Hope it helps.

Oct 14, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

The calculator only allows one line equation to show up at a time. There are also arrows where a division mark should be by the Y1, Y2, etc.


Hello,
Clear the you the RAM to revert to default settings and restart. I am including screen capture fro a TI to show you how to set up the calculator.

d4c969a.jpg

Notice the white-on-black equal signs. For a function to be drawn, the equal sign in its definition must be highlighted. To effect that you scroll left to the = and press ENTER. You will know the function has been selected for graphing if its equal sign remains white-on-black after cursor has moved to another location.

cb0d5d6.jpg
Here is what the 4 functions look like. They all are on same graph.
Now we will change the graph style of the cosine function.

fce7a77.jpg
The only difference between the first screen and this one is the style of the line at the left of the Y4. To change the style, you move to the cursor to the left of the Y and press ENTER. Each time you press êNTER, the style for the function in question changes. Here is the product.
00e0856.jpg
The wavy curve (cosine) is now dotted.

Hope it helps.

Oct 05, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

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


Hello,

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 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

1 Answer

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


Hello,
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.
09b72b9.jpg
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

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