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# 3.4 notes

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### 3.4 notes

1. 1. 3.4 Slope HW pg. 175 #3­9 odd, 13­29 odd 1 September 27, 2013 Oct 5­4:02 PM BELLWORK 1. Find the value of x that make p // q. 2. Which lines are parallel?  (2x + 43) (3x) #1 95 85 80 100 E D F G 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 Monday? p q a b #3­4 x = 43 EF // DG yes Alt. Interior < Converse I hope so!
2. 2. 3.4 Slope HW pg. 175 #3­9 odd, 13­29 odd 2 September 27, 2013 Oct 5­4:19 PM 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. 3. 3.4 Slope HW pg. 175 #3­9 odd, 13­29 odd 3 September 27, 2013 Oct 5­4:31 PM 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
4. 4. 3.4 Slope HW pg. 175 #3­9 odd, 13­29 odd 4 September 27, 2013 Oct 6­11:50 AM With your group, complete #3 in guided practice.
5. 5. 3.4 Slope HW pg. 175 #3­9 odd, 13­29 odd 5 September 27, 2013 Oct 6­11:48 AM
6. 6. 3.4 Slope HW pg. 175 #3­9 odd, 13­29 odd 6 September 27, 2013 Oct 6­11:54 AM
7. 7. 3.4 Slope HW pg. 175 #3­9 odd, 13­29 odd 7 September 27, 2013 Oct 6­12:23 PM With your group, complete problems 4 & 5 in guided practice.
8. 8. 3.4 Slope HW pg. 175 #3­9 odd, 13­29 odd 8 September 27, 2013 Oct 6­1:19 PM HW pg. 175 #3-9 odd, 13-29 odd