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Help, My TI-83 / Ti-84 Won’t Graph
8 o’clock at night. Dinner is over. You’re sitting down to watch a movie or Monday Night Football — and then it happens. . . “Mommmmmmmmm (or Daddddddddd), my calculator isn’t working. I have math homework tomorrow and my graph isn’t showing.”
“It can’t be that bad,” you think. “I passed high school math. I even installed a Quicken calculator at work. How complicated can a calculator be?”
The last time you looked at your child’s TI-83 or TI-84 was in August at the office supermarket; it was in front of the shopping cart, on top of which were three packages of rings and notebook paper. It didn’t seem so bad at the time, but now you look closely and there are all kinds of keys you’ve never seen before on a calculator. At the bottom is the familiar stuff — the usual array of number keys, and to the right are the usual addition, subtraction, multiplication and division keys. But what is “MODE”, “DEL”, “STAT”, “ZOOM”, “TRACE”, etc.? what do you do Who are you calling?
Relax.
There are a few really simple things to do here; but remember that the title of this article is “Help, my TI-83 / Ti-84 does not graph” and that is really all that is discussed in this article.
Graphic buttons
Look at the top row of buttons on the TI-83/TI-84 calculator. They should be five, separated from other buttons; and they must bear the following labels:
[Y=] [WINDOW] [ZOOM] [TRACE] [GRAPH]
This is where all your activity takes place.
Three main problems
Most of the time, when the graph is not displayed, there are three reasons:
- Graphical function.The graphics function was not entered correctly or was not entered at all.
- The graph is not turned on. The graphing function is entered correctly, but graphing is not enabled.
- Display window. The function’s viewing window is set to the wrong size or location.
We will work with these one at a time.
Check that the Graphical Function is entered correctly
click on [Y=] switch on the counter. This will take you to the Y= editor screen. You should see a screen that looks like this:
Plot 1 Plot 2 Plot 3
Y1= 2X+1
Y2 =
Y3=
Y4=
Y5=
Y6=
The expression “2X+1” is just an example, but you should see some kind of expression on the Y= editor screen, not just a bunch of empty “Y=” lines. If all you see is this, then you need to add the expression:
Plot 1 Plot 2 Plot 3
Y1=
Y2 =
Y3=
Y4=
Y5=
Y6=
If you want to test a really simple expression to make sure the calculator can plot, use “Y1 = X”. This should draw a nice 45 degree line straight through the origin of the graphics screen.
Check that the Graphics function is enabled
Function graphics may not be active on the Y= editor screen. This error is a bit subtle. Look for the “=” sign in the equation you want to plot. The “=” sign must be underlined.
If this is not the case, you should click the cursor on the “=” sign [ENTER] key to highlight it.
The View window must be adjusted to the correct size and position
If the viewing window is set to the wrong size or location, the calculator can plot, but you won’t see it on the screen.
There are many ways to set up a viewport, but the easiest and most reliable method is to not see the function you want to graph. click on [ZOOM] switch on the counter. Then press “3” to remove. Repeat until you see the function you want to graph. Now you should have some idea of which window to use to view the described function. click on [WINDOW] click on the calculator and adjust the display properties if necessary.
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