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Published on September 29, 2014

Author: Mrs_Hedrick

Source: slideshare.net

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Slope of Lines

3.4 Slopes of Lines (2x + 43) #1 HW pg. 175 #3­9 odd, 13­29 odd September 29, 2014 BELLWORK 1. Find the value of x that make p // q. (3x) 2. Which lines are parallel? 95 85 80 100 E D F G #3­4 3. Can you prove a // b? 4. If so, what theorem would you use? 5. Are you ready for the 3.1­3.3 Quiz on Tuesday? p q a b x = 43 EF // DG yes Alt. Interior < Converse I hope so!

3.4 Slopes of Lines = = HW pg. 175 #3­9 odd, 13­29 odd September 29, 2014 3.4 Find and Use Slopes of Lines Slope: ratio of vertical change (rise) to horizontal change (run) between any 2 points. Slope = rise change in y y 2 - y1 run change in x x 2 - x1 Negative Slope: falls from left to right Positive Slope: rises from left to right Zero Slope: horizontal line Undefined Slope: vertical line run (x2 - x1) rise (y2 - y1)

3.4 Slopes of Lines HW pg. 175 #3­9 odd, 13­29 odd September 29, 2014 Comparing Slopes: When 2 lines intersect, the steeper line has the slope with greater absolute value. Postulate 17: Slopes of Parallel Lines 2 lines are // iff they have the same slope. m1 = m2 Postulate 18: Slopes of Perpendicular Lines 2 lines are iff the product of their slopes is -1. m1 * m2 = -1 View slide

3.4 Slopes of Lines HW pg. 175 #3­9 odd, 13­29 odd September 29, 2014 With your group, complete #3 in guided practice. View slide

3.4 Slopes of Lines HW pg. 175 #3­9 odd, 13­29 odd September 29, 2014

3.4 Slopes of Lines HW pg. 175 #3­9 odd, 13­29 odd September 29, 2014

3.4 Slopes of Lines HW pg. 175 #3­9 odd, 13­29 odd September 29, 2014 With your group, complete problems 4 & 5 in guided practice.

3.4 Slopes of Lines HW pg. 175 #3­9 odd, 13­29 odd September 29, 2014 HW pg. 175 #3-9 odd, 13-29 odd

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