TI Lesson Weighing Pennies
Students weigh increasing numbers of pennies and plot their results. You have to extend to find the equation of the line. Interpret the slope as the weight of a penny. Determine why the weight is not constant.

What’s the Point?
This unit introduces students to technology as a means of graphing linear equations on a graphing calculator and finding the point of intersection and inputting data into lists.

Line of Best Fit
This is a practice lesson that has a java applet that plots points and the students can try their own line of best fit or let the computer do it.  The lesson allows students to enter their own data (from a class activity) or choose the data given in the Exploration section.  Very good for a clear visual approach to teaching this concept.

Analysis of Classroom Participation
This is a lesson where students use data from an elementary classroom to draw a scatter plot and create a line of best fit.  The lesson probably goes further than you need in Algebra I, but can be easily adapted to answer questions for any best fit activity.

QELP
This website is full of different data sets, including linear sets. The data is very clean and easy to use. You can download excel files, rich text or Minitab.

Guessing Correlations
This is a game that displays random scatterplots. Students match 4 of them to their correlation coefficient.

The Cartesian Coordinate Plane
Interactive lessons on midpoint and distance on the Cartesian coordinate plane, including a java applet that does scatterplots and linear regressions. 

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