# 3 Lines On Top Of Each Other In Math Means Help, My TI-83 / Ti-84 Won’t Graph

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## Help, My TI-83 / Ti-84 Won’t Graph

It’s 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 Dadddddddddddd), my calculator isn’t working. I have math homework due tomorrow and my graph isn’t showing up.”

“This can’t be that bad,” you think. “I passed high school math. Heck, I even installed the Quicken accounting system 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 store; she was in front of a shopping cart with three ring notebooks and notebook paper on top of a stack. It didn’t look so bad back then, but look closer now and there are all kinds of keys you’ve never seen on a calculator. At the bottom is something familiar: a normal array of number keys, and to the right are the usual addition, subtraction, multiplication and division keys. But what the hell are “MODE”, “DEL”, “STAT”, “ZOOM”, “TRACE”, etc.? What will you do? who will you call

Relaxed.

The graphics buttons

Look at the top row of buttons on the TI-83/TI-84 calculator. There should be five of them, separate from the other buttons; and should have the following tags:

`      [Y=]   [WINDOW]   [ZOOM]   [TRACE]   [GRAPH]`

This is where all your activity will take place.

The three big problems

Most of the time when a chart doesn’t show, there are three reasons:

1. Graphical function.The chart function was not entered correctly or was not entered at all.
2. Chart not activated. The graph function was entered successfully, but the graph is not enabled.
3. View window. The function viewport is set to an incorrect size or location.

We will deal with these one at a time.

Check that the graph function has been entered correctly

push the [Y=] key at the top of the calculator. This brings you to the Y= editor screen. You should see a screen 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 need to see some kind of expression on the Y= editor screen, not just a bunch of blank “Y=” lines. If all you see is the following, you’ll need to add an expression:

Plot 1 Plot 2 Plot 3

Y1=

Y2=

Y3=

Y4=

Y5=

Y6=

If you want to test a very 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 graph screen.

Make sure the chart feature is turned on

Function graphing may not be enabled on the Y= editor screen. This bug is a bit subtle. Look for the “=” sign in the equation you are trying to represent. The “=” sign must be emphasized.

If not, you need to put the cursor on the “=” sign and press the button [ENTER] key, to highlight it.

The viewport must be set to the correct size and location

If the viewport is set to the wrong size or location, the calculator can draw but you won’t see it on the screen.

There are many ways to set the viewing window, but a simple and reliable method is to simply “Zoom Out” until you see the function you’re trying to graph. push the [ZOOM] key at the top of the calculator. Then press “3” to shrink the image. Repeat until you see the function you are trying to graph. You should now have an idea of ​​which window to use to view the rendered function. push the [WINDOW] at the top of the calculator and adjust the display features as needed.

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