The following is a step-by-step guide on how to graph a line on a graphing calculator.

(Tested on a Texas Instrument TI-84 Plus)

1.) Press **STAT** and choose **1: EDIT**.

2.) If there are numbers listed you will needed to clear the numbers. If it is already clear then go on to the next step. To clear the numbers:

Make sure **L1 is highlighted**, then press **CLEAR**, then press **DOWN ARROW**.

To clear the next column hit the **ARROW BUTTONS** until **L2 is highlighted**, then press** CLEAR**, the press **DOWN ARROW**.

3.) Now enter the data numbers into List 1 (L1) by pressing each **number** followed by the **ENTER** button.

Hit the **RIGHT ARROW** to enter the L2 column and begin entering the data **numbers** into List 2.

4.) Next select **STAT PLOT** by pressing **2ND** then **Y=**.

5.) Select **1: Plot1** by pressing **1**.

6.) Make sure of the following:

**Plot1** is highlighted

**ON** is highlighted

The **first graph** after **Type:** is highlighted

Xlist: **L1**

Ylist: **L2**

The **square** after **Mark:** is highlighted.

Your screen should match the image to the right.

7.) Press **ZOOM**, then **9**. You will now see a graph.

8.) Now press **STAT**, then **RIGHT ARROW** to highlight **CALC**, then press **4** to select **4:LinReg(ax+b)**

9.) Your screen should now say:

LinReg(ax+b)

Now press **2ND**, then **1** to output** L1**.

Then press the **COMMA BUTTON**, then press **2ND** , then press **2** to output** L2**.

Then press the **COMMA BUTTON**, then press **VARS**, then press **RIGHT ARROW** to highlight

**Y-VARS**, the press **1** to select **FUNCTION**, the press **1** to select **1:Y1**.

10.) Your screen should now say:

LinReg(ax+b) L1, L2, Y1

Now press **ENTER**.

11.) Your screen should now say:

LinReg

y=ax+b

a=(decimal number)

b=(decimal number)

r2=(decimal number)

r=(decimal number)

**Write down the number after ‘a=’. That is your slope. You can round it to the second decimal place.**

** Write down the number after ‘b=’. That is your y-intercept. You can round it to the second decimal place.**

** Plug these numbers into slope-intercept form to get your equation of the line (y=mx +b).**

12.) Now press **ZOOM**, then press **9**.

You graph should appear with the Line of Best Fit drawn.

**Copy the graph down as close as possible. It does not have to be exact.**