# How do you find the equation of a regression line with a TI-83?

##### 1 Answer

Enter the data into two lists first.

#### Explanation:

I will use brackets to indicate a button on the calculator and ALL CAPS to indicate what function to use.

Let X and Y be your two variables, corresponding to a collection of points.

Press [STAT] and then choose EDIT or press [ENTER].

This will open up the lists where you will enter the data.

Enter all of the values for X in list 1, one by one. Put a value in, then press [ENTER] to move down to the next line.

Now enter all of the values for Y into list 2 the same way.

Now press [STAT] again.

Use arrow keys to move to the CALC list of functions.

These are statistical calculations.

Choose item [4], which is labeled LinReg(ax + b).

That is, this is the **Linear Regression** function of the TI-83.

On the next screen, type

[2nd] [1] [,] [2nd] [2].

Notice that you need the comma button.

This tells the calculator which lists you will be using for regression. [2nd] [1] means List 1, for example.

Then press [ENTER], and *voila!*