Students will "discover" that perpendicular lines have negative reciprocal slopes.
Before the Activity
If you are using the TI-Navigator System with the TI-73 you will need the attached .pdf file.
Do Slope Drill.edc to review with students the rules for slopes of parallel lines.
During the Activity
Read through lesson instructions on Slopes of perpendicular lines.doc. open perpendicular slope activity.act in the activity center.
After the Activity
Use the screen shot and slope teacher aid.doc to assess students at the end of the lesson.