1. Write an equation of a line through (2,3) and (-3, 7) 2. Write and equation of a line through (4,8) and (4, 2) Warm Up.

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Presentation transcript:

1. Write an equation of a line through (2,3) and (-3, 7) 2. Write and equation of a line through (4,8) and (4, 2) Warm Up

Homework Please feel free to ask me questions concerning the Homework!! Remember: Tutorials ~ Monday And Thursday 1 st half of lunch Additional Meeting Times Upon Request

NEGATIVE SLOPES Day 6

Quick Review  Graded for accuracy…

Negative Slopes Let’s learn all about Negative Slopes !! Make sure to have out graph paper, calculator, pencil and notebook/binder for notes

On what intervals is the slope negative? What is the velocity on these intervals?

Negative slope = -2 mi/min Negative slope = -0.5 mi/min Negative slope = -3 mi/min

Find the errors in this story… According to the Graph on the left. How should the story be corrected? Is the Original Story a lie? Story time – correct the errors: In my search for corn muffins, I ran toward Watson’s house pretty fast for a while, then I took a break for 6 minutes. I realized I needed to go home, so I started at a slow pace (with velocity of 2 blocks/minute), then got faster, but turned around. From there I quickly ran a block past Billy’s house, then ran home really fast.

Story time – correct the errors: In my search for corn muffins, I ran toward Watson’s house really fast for a while, then I took a break for 6 minutes. I realized I needed to go home, so I started at a slow pace (with velocity of 2 blocks/minute), then got faster, but turned around. From there I quickly ran a block past Billy’s house, then ran home really fast.

Negative Slopes Classwork Handout 3-6

Buying on Credit…please take notes on a piece of Graph Paper Electric Avenue sells audio/video, computer, and entertainment products. The store offers 0% interest for 12 months on purchases made using an Electric Avenue store credit card. Emily purchases a television for $580 using an electric Avenue store credit card. Suppose she pays the minimum monthly payment of $25 each month for the first 12 months. Copy & complete the following chart: Number of monthly payments Account Balance (in dollars)

Electric Avenue sells audio/video, computer, and entertainment products. The store offers 0% interest for 12 months on purchases made using an Electric Avenue store credit card. 1. Emily purchases a television for $580 using an electric Avenue store credit card. Suppose she pays the minimum monthly payment of $25 each month for the first 12 months. Copy & complete the following chart: Number of monthly payments Account Balance (in dollars) Buying on Credit…please continue to take notes on a piece of Graph Paper

Let’s make a graph of our data…be sure to place scale on x and y axis…it will be TALL!! Number of monthly payments Account Balance (in dollars)

1. Will Emily pay off the balance within 12 months? How do you know? 2. If you know Emily’s account balance NOW, how can you calculate the NEXT account balance, after a monthly payment? 3. Which of the following function rules gives Emily’s account balance E after m monthly payments have been made? E = 25m – 580E = m – 25 E = E = m E = m Buying on Credit…Questions Part One

1. Will Emily pay off the balance within 12 months? How do you know? Nope – she’ll pay $25x12 = $ If you know Emily’s account balance NOW, how can you calculate the NEXT account balance, after a monthly payment? next = now - $25 3. Which of the following function rules gives Emily’s account balance E after m monthly payments have been made? E = 25m – 580E = m – 25 E = E = m E = m Buying on Credit…Question Answers Part One

5. Determine the rate of change, including units, in the account balance as the number of monthly payments increases from: 0 to 2; 2 to 3; 3 to 6; 7. How does the rate of change reflect the fact that the account balance decreases as the number of monthly payments increases? ii. How can the rate of change be seen in the graph from Part a? iii.In the function rule(s) you selected in Part c? Buying on Credit…Questions Part Two

5. Determine the rate of change, including units, in the account balance as the number of monthly payments increases from: 0 to 2;-50/2 = -$25/month 2 to 3;-25/1 = -$25/month 3 to 6;-75/3 = -$25/month 7. How does the rate of change reflect the fact that the account balance decreases as the number of monthly payments increases? it’s NEGATIVE!!! ii. How can the rate of change be seen in the graph from Part a? slope = -$25/month iii.In the function rule(s) you selected in Part c? slope = -$25/month Buying on Credit…Question Answers Part 2

Important Homework Information  Homework 3-6  Come to Tutorial!  Mondays AND  Thursdays 1 st half of Lunch!  UNIT 3 TEST is this Friday, October 2 nd ! Study, Study, Study!!