In the previous version of the graphing tool there was a button for ** linear regression**. That has been replaced by the following steps:

click the cog at the upper right of the graph

select

*Curve Fit*choose

*Linear*click

*Done*

You can click on data points on the graph to include/exclude them from the curve fit calculations.

As a student, your data always saves as you go so you can return to your work later to continue or revise.