# Graphing Calculator

To generate a graph from data, using your TI-83 or TI-84 calculator you need to enter the data into Lists.

The first thing you should do is to clear any previous data stored in the Lists.

Press the STAT button

and then choose option 4

to clear Lists.

(To see a qt movie of the calculator steps, click on the link.)

We want to clear at least L1 and L2, so press the following keys:

"2nd"   "1"   ","   " 2nd"    "2"    "Enter"

Now we want to get into our lists to enter data.

Press the STAT button and then choose option 1

to Edit the Lists and enter data.

We will enter the following data into L1 by pressing the Enter key to move down our list.

0
0.5
1
2
3
4

Then press the right arrow to move into L2 and then enter the following data:

2
8
14
26
38
50

To graph our data, we press the keys: "2nd" "Y=" and then "1" to turn plotting on and specify the type of graph. Make sure the "ON" option is highlited and choose the second option of the line grraph.

Our "x" axis will contain L1 and the "y" axis will contain L2.

Press the "GRAPH" button to display the graph. You can change the window size and scale of the graph, by pressing the "WINDOW" button.

Since our data looks like a linear relationship, we can find the equation of the line by doing a Linear Regression to find the slope and y-intercept. To do this, we press the "STAT" button again and use the right arrow to get the "CALC" options and then press ENTER (twice).

This will give us the information at right which shows a slope of 12 and intercept of 2. So the equation of the data is:

y = 12x + 2

##### Practice:

Try generating a graph and equation for the following data which represents Force measured in Newtons and mass measured in kilograms.

L1 should contain the mass data:

0.10
0.20
0.30
0.40
0.50

L2 should contain the Force data:

1.40
3.30
5.10
7.00
8.90