We reviewed parallel and perpendicular lines:
|Parallel Lines||Perpendicular Lines|
|Never touch, unless they’re the same line||Touch at exactly one point|
|Travel in the same directions||Travel in “opposite” directions|
|Have the same slope ()||Have slopes that are negative reciprocals ()|
Remember that horizontal lines have a slope of 0, and vertical lines have undefined slope.
Then we graphed three lines using three strategies: Table of Values (ToV), Intercepts, and Slope-y-Intercept ( & ). Here are the notes we took:
Homework for tonight is to complete Page 17 #7, 8ac, 9ac.
If you need more graph paper you can find some at http://www.printfreegraphpaper.com/ (I recommend the 1/4″ or the 10mm Cartesian paper for most purposes).