Question about Texas Instruments TI-89 Calculator

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How do you change the units on the x-axis to terms of pi?

I want to change the x-axis to show the location of points on a graph from numeric to fractions and multiples of pi

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The xmin and xmax values are the left and right endpoints (respectively) for the x-axis. In window settings type - pi and + pi for your request. At fist type diamond button and then F2 to get window menu

Posted on Mar 23, 2014


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Posted on Jan 02, 2017

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SOURCE: My Graphing calculator has no x or y axis. Its all Blank.

Press the 2nd Button then the ZOOM button. Make sure that AxesOn is highlighted. If not, move your cursor down until you on AxesOn and press ENTER.

If AxesOn is highlighted, then it is probably your window. Press ZOOM, then 6.

Posted on Jun 16, 2009

SOURCE: no x and y axis!

Hit [2nd] [ZOOM] and make sure "AxesOn" is selected

Posted on Jan 28, 2008

  • 35 Answers

SOURCE: TI-82 graphing problem

You must press 2nd then "zoom", then go down to axes, and turn them on. Now your graph will work again.

Posted on Aug 27, 2007

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SOURCE: graph problem

Press ZOOM and select ZoomStd (Zoom standard) oe press WINDOW and enter you values of Xmin, Xmax, Ymin, Ymax.
Hope it helps.

Posted on Nov 26, 2009

  • 35 Answers

SOURCE: my ti 84 graphs the line but will not show the x

Above the top row of keys one option will be Format (I believe 2nd and then Window). You can turn on and off the axes in this menu.

Posted on Mar 06, 2011

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How do I find a slope then describe what it means in terms of the rate of change of the dependent variable per unit of the change in the independent variable.

Slope is defined in many ways. Some use rise over run. y over x. delta y over delta x. I find the easiest way to find it is to draw a triangle to calculate the slope. I try and pick points on the line that go through the corners of the graph paper to more accurately measure the slope. The bigger the triangle the better. Now count the number of squares going up and down and the number of square going left to right. Divide the change in y by the change in x. This is your slope. If the line is going up to the right. the slope is positive. If it is going up to the left, the slope is negative.

"describe what it means in terms of the rate of change of the dependent variable per unit of the change in the independent variable."

If the y axis is distance and the x axis is time, the slope will be kilometers/hour, or speed, the rate of change.

Good luck.

Feb 24, 2015 | Office Equipment & Supplies

1 Answer

How can you graph a spherical shape when z axis is predeined as z(x,y) ?

You need to set the graphing mode to 3D. In 3D graphing the function is represented as z(x,y)=function of the variables x and y.
Here are a few screen capture to show you how to set the thing up.
Read the calculator manual.


On the last screen are the parameters to change the point of view.

Aug 29, 2014 | Texas Instruments TI-92 Plus Calculator

1 Answer

Can i ask how to answer this?2x-4y-9=o

That is an equation describing a straight line. The "slope-intercept" form of a line is

y = mx + b

where m is the slope (change in y-value / change in x-value)
and b is the y-intercept (the point where the line crosses the y-axis when x=0)

Positive slope means the line is rising and negative slope means it's falling.

You can rewrite the original equation 2x - 4y -9 = 0 in slope-intercept form:

y = (1/2)x - (9/4)

So you know the slope is positive 1/2 (line rises 1 y-unit for each 2 x-unit change) and crosses the y-axis at -9/4. With this information you can graph the line.

Jul 12, 2011 | Sewing Machines

1 Answer

My TI-84 PLUS calculator wont show the graph after i type in an equation. please help!

You need to fix your graph so that it shows the correct y-axis and x-axis.
It works best if you press the zoom button and then scroll to find the ZoomFit option.
Then the graph should show up.

Jun 15, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

Need help with rate of change and direct variation

No need for a claculator to understand these concepts.
A linear function is a function of the form y=ax+b. It contains an independent variable,x, a dependent variable, y, and two constants, a and b,
The value of the constant a is the measure of the rate of change of the function, The value of the constant b is the ordinate (value along the y-axis) where the straight line cuts the y-axis. It is called the y-intercept, or the initial value.
If the value of b=0, the straight line passes through the origin O(0,0). The purists call this type of variation, a direct variation. If b is not equal to 0, it is called a partial variation or some other name.

If you have the graph drawn, b is read off the y-axis: You look at the graph and try to estimate the ordinate of the point where the line cuts (intersects) the y-axis.
To get the rate of change a, you select two points on the line. Let 1st point have coordinates (x1,y1) and the 2nd point have coordinates (x2,y2).
The rate of change is given by the ratio (y2-y1)/(x2-x1). You can also use a= (y1-y2)/(x1-x2). Respect the order in the two expression or you will get the negative value of the rate of change.

May 10, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

Hi, I'm trying to graph Y= sin(x) and Y=0.5x at the same time. I know that the 0.5x graph is supposed to look like a line going through the origin diagonally but when I press "ZoomTrig" to get...

Set Zoom to Standard Zoom Std or arrange windows limit as follows
As to Xmin and Xmax it depends on the angle unit. It would be best for you to use Radians. In that case you can set Xmin=-Pi and Xmax=Pi.

If you are using degrees as angle unit, you must set Xmin=-180 and Xmax=180 to get the sine but you will not be able to see much of the 0.5X function because it will shoot out off the graph.

My unsollicited advice is to use the radian as unit

Feb 21, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

I have this different type of graph, it is onle showing the right side of my graph...I can only see the positive x axis. How do I change it to the full graph, where I can see the positive and negative x...

Press MODE to bring up the mode screen. Use the arrow keys to highlight "FULL" on the eighth line and press ENTER. Press 2ND [QUIT] to exit the mode screen.

Feb 03, 2011 | Texas Instruments TI-84 Plus Calculator

2 Answers

TI-83 graph problems-help please. Hi, sorry to sound so stupid, but trying for hours to try to solve these using my calculator,but doing something wrong as can't get the right answers. I wonder if anyone...

Open Y= editor and type in the two functions
The calculaus functions are accessible by pressing [2nd][TRACE] to open the CALCulate menu options. For the gradient (I think you mean the derivative) use option 6:dy/dx. But first choose the point where you want it calculated (use cursor to move along the curve) and press ENTER. The value of the deivative will be calculated at the chosen point.

The vertex of the parabolas are maxima. Thus you must use option 4:maximum
You will be prompted for a left bound. Move cursor to the left of the maximum (not too far) and press [ENTER]. A fat arrow is displayed on the graph that shows the left limit of the interval. You will be prompted for a right bound. Move cursor along the curve to the right of the the vertex. Press ENTER. A seconf fat arrow will be displayed to show the right limit of the interval.

You will be prompted for a guess of the maximum. Move cursor newar the max or enter a numerical value and press ENTER.


The location of the vertex is displayed (X and Y values)
I have no idea what you mean by the equation of symmetry


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

1 Answer

How to chang the size of the numbers

The title of the thread and the body of the question do not seem related. Or maybe I do not understand

A. Font size
If you want to change the font size in documents.
  1. Press the Home button
  2. Use arrows to highlight 8:system Info
  3. Press the Click button
  4. Select 2: System Setting and Press Click
  5. Use the tab key to highlight the Font size
  6. Use the down Arrow to unfold the menu and select Large
  7. Use the Tab repeatedly until you reach the OK button and Click or ENTER
  8. Accept the changes by pressing Yes.
Graph window ZOOM

If you have a graph and geometry document open (whether there is a graph or just the axes)
  1. Press the MENU button
  2. Select 4:Window
  3. Press Right Arrow to unfold the menu list
  4. Select the Zoom type
  • Window settings: You set your values
  • Zoom box: Select the corners of the box by moving cursor to desired position and press ENTER or Click.
  • Zoom In select center of graph and the graph will be redrawn
  • Zoom Out select the center
  • Zoom Standard :Standard window dimensions (default values)
  • Zoom Quadrant 1; restrict the graph to the first quadrant
  • Zoom Trig: When drawing trigonometric functions, dimensions are multiples of Pi.
  • Zoom Fit : The zoom is arranged to encompass all data.
  • Zoom square.
You can do certain manipulations by moving the cursor towards the axes. When the hand appears press Click/hand to grab. Pull out (away from an axis) or in (towards an axis). You can pull horizontally or vertically. The graph will react to the pull.

Jan 31, 2010 | Texas Instruments TI-Nspire Graphic...

3 Answers

How to set the window?

Press [Window]
Set the values of Xmin, Xmax, Ymin, Ymax.
If the x values that the function takes are all positive, you may set Xmin =0. If the values of the function are all positive, you can set Ymin=0.
If you are drawing a sine or a cosine function, you know that the function values are between -1 and +1, so you cant restict Ymin an Ymax to say -1.2 and 1.2. Similarly if you draw trigonometric function no need to have a range of X values between -10 and 10: the function being periodic you can restrict values (in radians to -pi to +pi, ) or to -90 to +90 degrees.
You set the limits of the window by making use of your knowledge of the functions you are drawing.

Hope it helps.

Sep 19, 2009 | Texas Instruments TI-83 Plus Calculator

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