# Find A Possible Formula For The Graph Y 1 X Help, My TI-83 / Ti-84 Won’t Graph

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## Help, My TI-83 / Ti-84 Won’t Graph

It is 8 o’clock at night. Dinner is over. You’re sitting down to watch a movie or watch Monday Night Football – and then it happens. . . “Mommmmmmmmm (or Dadddddddddd), my calculator isn’t working. I have to start my math homework tomorrow, and my graph isn’t showing up.”

“It 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 saw your child’s TI-83 or TI-84 was in August at the Office Superstore; It was in front of a shopping cart piled high with three ring binders and notebook paper. It didn’t look so bad at the time, but now you look closer and there are all kinds of keys you’ve never seen before on a calculator. Below is something familiar – a normal-looking 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 are you going to do? Who to call?

relax

Graphing buttons

Look at the top row of buttons on the TI-83/TI-84 calculator. There should be five of them, set apart from other buttons; And they should have the following labels:

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

This is where all your activities are going to be.

Three major problems

Most of the time when a graph is not displayed, there are three reasons:

1. graph function.The graph function is not entered correctly, or not entered at all.
2. Graph is not turned on. The graph function is entered correctly, but graphing is not turned on.
3. Looking out the window. The viewing window for the function is set to the wrong size or location.

We will deal with these one at a time.

Check that the graph function is entered correctly

push [Y=] key at the top of the calculator. This will put you in the Y= editor screen. You should see a screen that looks like this:

Plot1 Plot2 Plot3

Y1= 2X+1

Y2 =

Y3 =

Y4 =

Y5 =

Y6 =

The expression “2X+1” is just one 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 need to add an expression:

Plot1 Plot2 Plot3

Y1 =

Y2 =

Y3 =

Y4 =

Y5 =

Y6 =

If you want to try a really simple expression to make sure the calculator can plot it, use “Y1=X”. It should plot a nice 45 degree line straight through the origin of the graph screen.

Check that the graph function is activated

It is possible that the graphing of the function is not opened in the Y = editor screen. This error is a bit subtle. The equation you want to plot should have the “=” sign “=” sign, highlighted.

If it is not, you should cursor over the “=” sign and press [ENTER] Key, to highlight it.

The viewing window must be set 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 the viewing window, but an easy and reliable method is to “zoom out” until you see the function you’re trying to graph. push [ZOOM] key at the top of the calculator. Then press “3” to zoom out. Repeat until you see the function you are trying to graph. Now you should have some idea which window you need to use to view the action plotted. push [WINDOW] Place the key on top of the calculator and adjust the display characteristics as necessary.

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