Check Homework Answers

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Check Homework Answers
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Independent/Dependent Variables Interpreting
Graphs

• Wednesday, November 04, 2009

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Independent Dependent

• From Graphs
• Independent variable is on the x-axis.
• Dependent variable is on the y-axis.
• From Tables
• Independent variable is in the left column or top
  row.
• Dependent variable is in the right column or
  bottom row.

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Independent Dependent

• From equations
• The independent variable is the one in the
  expression (usually x).
• The dependent variable is the one set equal to
  some expression (usually y).
• Example

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EX identify the ind. and dep. variables.
Ind Decade Dep Average Salary
Ind m Dep C
Ind Time Dep Number of drinks
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Example Describe what the graph tells you.

• The person starts walking slowly away from home
  and speeds up.
• Then stops for a little bit.
• Then walks away from home quickly.
• Stops again.
• Walks quickly back towards home.
• Stops again.
• Walks quickly back home and slows down as she
  gets really close to home.

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Example
Sketch a graph of the altitude of a pelican, from
take off from shore to diving to the water to
catch a fish. Label each section.
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Example

• Suppose you drink the remaining soda from a can
  in 10 seconds at a steady rate. Describe the
  graph of the change in height of the liquid over
  time.
• The graph would be a straight line from the
  original height at time 0 to zero height after 10
  seconds.

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Example
Use the graph for questions 13.               1.
Why does this graph not start at zero? 2. Why is
the graph not a straight slanted line? 3. What
does the flat part at the top of the graph
represent?
A persons height is not zero when born.
A straight line represents a constant rate of
growth and people do not grow that way.
The person has stayed the same height over a long
period of time.
4. Would a horizontal line, a straight slanted
line, a curve, or a jagged curve best represent
the calories you burn during the day?
a jagged curve