Chapter 3 Section 1

1
Chapter 3 Section 1

• Reading graphs
• Plotting points
• Estimating Values

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Warm-up

• Solve the following

Give set-builder, interval, and number line
3
Graphs

• A graph is a picture representation of
• A function OR
• A set of data
• Graphs come in many styles
• Bar graph
• Pie chart
• line graph

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reproduced from data used in the text.
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Questions

• How many drinks would a 200lb person have to
  drink in 1hr to have a 0.08 BAC?
• If Steve has a BAC less than 0.08 after drinking
  4.5 drinks in 1hr, what can we say about his
  weight?
• Tina has a BAC of 0.10 after just 3 drinks.
  What can we say about her weight?

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These are totally made up numbers just to make
the point!
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Pie Chart - Questions

• Roughly how much more popular is apple pie than
  peach pie?
• Name two types of pie that are roughly equally
  popular.
• In both cases, use the chart to identify the
  answers, not the percentage numbers

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Coordinates

• Bars and pies are nice for categorical data, but
  Cartesian coordinates are often far more useful
• line graphs
• equations (sect 3.2)
• Devised by Rene Descartes
• use two perpendicular number lines
• X and Y axes
• each point is given by two numbers (x,y)

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Identify the points
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Make a graph

• Draw a set of coordinates and mark off the
  following points
• (8,7)
• (3,-5)
• (-7,-5)
• (4,6)
• (2,0)
• (0,0)
• (-3,2)

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Some Names

• Origin the point (0,0)
• Axis the number lines
• Abscissa the x-axis value of a point
• Ordinate the y-axis value of a point
• Quadrant each quarter of the graph cut off by
  the axes
• Ordered pair the two values for a point, in
  (x,y) order

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Battleship

• Collaborative Corner, page 174
• Groups of 2
• 10 yes/no questions to find the battleship!
• Play 2 rounds everyone gets to play each part
  against each other person
• If an extra person is in your group, they can
  double-check

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Line Graph
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Questions

• How long does it take to get to a heart rate of
  80BPM?
• After how many months is this persons resting
  heart rate at a minimum?
• What is that minimum heart rate?

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Try making one Athletes Foot!
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(No Transcript)
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Question

• What might have happened after month 7?

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The Window (page 167)

• Text book convention Left, Right, Bottom, Top
• So, -10, 10, -5, 20 looks like what?
• Lets set the WINDOW on our calculator

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Your Turn

• Page 171, Problem 26. Lets try doing it with the
  calculator.
• TI Calculator Help