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January 4th & 5th:     4.1 Getting Started with Slope

Open your books to  1. With your partner, determine which roof is the 
page 309.           steepest.  Then write down how you might explain how 
                    you decided which roof is the steepest to a person who 
                    does not understand the words steep  or slope. (4 
                    minutes)




                     2a. What are the rise and run of the gable end?




                     2c. What is the mathematical process we would need to 
                     follow to find the length of each of the vertical boards?




                                                                                 1
For You to Explore:   Take 4 minutes to discuss and record your ideas for Tony 
                      and Sasha's bike trip.  Be prepared to share your ideas 
                      with the rest of the class.

                      3a. Who rode faster, Tony or Sasha?  Explain.




                      3b. What does the intersection of the lines represent?




                      3c. How many miles did Sasha travel in an hour?




                      3d. How many miles did Tony travel in an hour?




Checkpoint: Draw      After each equation is shown, "draw" the general 
that graph!           shape of the corresponding graph in the air with your 
                      finger.

                      a. y =x




                      b. y = x2




                      c. y = 5x + 2




                      d. y = x3 + 5




                      e. y = 4x2 ‐ 13 + 2x ‐ 7




                      f. y = 2(13 ‐ 7x)




                                                                                  2
4.2 Pitch and Slope
Using pitch and slope:   Pitch:  Used by _________ to describe the steepness of a 
                         roof.
                         •  

                         •    




                         Slope: Used by _____________ to describe the 
                         steepness of a line between two points in the Cartesian 
                         plane.
                         •   

                         •     




Finding the slope 
                         Find the slope of the line that connects A(3,1) and 
between 2 points:
                         B (7,9).




                         Find two other points, S and T, such that m(S, T) is the 
                         same as m(A, B).



                         Is m(S, T) = m(T, S)?




Finding slope            With your partner, find the slope between the points 
continued...             R(7,2) and S (10,0). 




Defining Slope:          Given the two points A (x1, y1) and B (x2, y2):

                         m(A,B) =  rise  =        y  =  y2 ‐ y1
                                    run            x       x2 ‐ x1



                         Positive/ Negative Slope:



                         Magnitude of Slope:




Special slope cases:      Find the slope between (4, 8) and (4, 2).




                         Find the slope between (7,2) and (3,2)




                                                                                     3
Exit Slip:            Write an example of two slopes for each of the 
Complete on a         following statements:
separate half‐sheet
with your partner.    a. a positive slope and a negative slope that is steeper




                      b. a negative slope and a positive slope with the same 
                      steepness




                      c. two pairs of points that have the same slope




                      d. a pair of points whose slope is undefined.




Homework:             Pg. 311‐312 # 7,8, 10‐12, 13abc, & 14abc
                             317‐318 # 7abcd, 8bdef, 9, 10, 




                                                                                 4

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4.1 4.2 Notes A

  • 1. Open er!!! January 4th & 5th:     4.1 Getting Started with Slope Open your books to  1. With your partner, determine which roof is the  page 309. steepest.  Then write down how you might explain how  you decided which roof is the steepest to a person who  does not understand the words steep  or slope. (4  minutes) 2a. What are the rise and run of the gable end? 2c. What is the mathematical process we would need to  follow to find the length of each of the vertical boards? 1
  • 2. For You to Explore: Take 4 minutes to discuss and record your ideas for Tony  and Sasha's bike trip.  Be prepared to share your ideas  with the rest of the class. 3a. Who rode faster, Tony or Sasha?  Explain. 3b. What does the intersection of the lines represent? 3c. How many miles did Sasha travel in an hour? 3d. How many miles did Tony travel in an hour? Checkpoint: Draw  After each equation is shown, "draw" the general  that graph! shape of the corresponding graph in the air with your  finger. a. y =x b. y = x2 c. y = 5x + 2 d. y = x3 + 5 e. y = 4x2 ‐ 13 + 2x ‐ 7 f. y = 2(13 ‐ 7x) 2
  • 3. 4.2 Pitch and Slope Using pitch and slope: Pitch:  Used by _________ to describe the steepness of a  roof. •   •     Slope: Used by _____________ to describe the  steepness of a line between two points in the Cartesian  plane. •    •      Finding the slope  Find the slope of the line that connects A(3,1) and  between 2 points: B (7,9). Find two other points, S and T, such that m(S, T) is the  same as m(A, B). Is m(S, T) = m(T, S)? Finding slope  With your partner, find the slope between the points  continued... R(7,2) and S (10,0).  Defining Slope: Given the two points A (x1, y1) and B (x2, y2): m(A,B) =  rise  =        y  =  y2 ‐ y1  run            x       x2 ‐ x1 Positive/ Negative Slope: Magnitude of Slope: Special slope cases:  Find the slope between (4, 8) and (4, 2). Find the slope between (7,2) and (3,2) 3
  • 4. Exit Slip: Write an example of two slopes for each of the  Complete on a  following statements: separate half‐sheet with your partner. a. a positive slope and a negative slope that is steeper b. a negative slope and a positive slope with the same  steepness c. two pairs of points that have the same slope d. a pair of points whose slope is undefined. Homework: Pg. 311‐312 # 7,8, 10‐12, 13abc, & 14abc        317‐318 # 7abcd, 8bdef, 9, 10,  4