Parallel and Perpendicular Lines

Video - 

• http://www.youtube.com/watch?v=Rew54K6mYUo&feature=related
• http://www.youtube.com/watch?v=ZHmQahVXCps&feature=related

 

Tutorial - 

http://www.purplemath.com/modules/slope2.htm

 

Writing the equations of parallel and perpendicular lines

http://www.youtube.com/watch?v=Lc3dPkoCOHc