3.7 Finding equations of lines.

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Presentation transcript:

3.7 Finding equations of lines.

Ex 1 Find the equation of a line thru 2 points  

Ex 2  

Ex 3  

How to find the vertical and horizontal lines thru any point?  

 

H.W. pg 194 30-41 all and W.S.

3.8 Slopes of Parallel and Perpendicular lines.

Rules: #1 all vertical lines or horizontal lines are parallel. #2 Any other lines are ll , if they have equal slopes. #3 Any one vertical line and one horizontal line are perpendicular. #4 Any other lines , if the slopes multiply and equal -1 they are perpendicular.

#5 IN other words perpendicular slopes are opposite reciporcal #5 IN other words perpendicular slopes are opposite reciporcal. (or flip the slope and change the sign) love Bonin

Quick Review : slope equation  

Example #2 Find the slope of each pair of points line p (-4,2) (0,-4) and line t (-5,-3) (4,3). Are they Parallel , perpendicular or neither?

Find the equation of lines.  

Find the equation of lines.  

H.W. pg 201 7-21 odd show all work! 23-26 all

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