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Line graphs, Line graphs, slope, and slope, and
interpreting interpreting line graphsline graphs
Charalee PeraCharalee PeraIncorporating Technology into the Incorporating Technology into the
ClassroomClassroomWednesday September 29Wednesday September 29 20102010
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Standards
9d. Students will recognize the slope of the linear graph as the constant in the relationship y = kx and apply this principle in interpreting graphs constructed from data
9g. Students will distinguish between linear and nonlinear relationships on a graph of data
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Warm Up WED. 8-18-10•Take out BW5c•Use the data below to make a line graph
Volume of Water (mL)
Freeze time (min)
100 5200 12300 17400 22
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How to draw a line graph
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How to draw a line graph
(Y axis)
(X axis)
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How to draw a line graph
Manipulated or Independent Variable
Responding or Dependent Variable
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How to draw a line graph•Equally spaced intervals
•Covers the range of data you have
•Should begin at zero when possible
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How to draw a line graph
Use the coordinates
from your data to plot a data point on the
graph
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How to draw a line graph
•A smooth line that reflects the general pattern of the graph
•As close to each point as possible
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How to draw a line graph
Identify the
variables and their
relationship on the graph
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What is the formula used to calculate
slope?
Sloperise
run or
y2 y1
x2 x1
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0 1 2 3 4 5 6 7 8 9 10
1
1098765432
MASS(g)
VOLUME (cm3 or mL)
X
Y The Density Lab
M V D
8.5 6 1.43
6.5 4 1.63
4 3 1.33
DATA TABLE
*
*Y2
y1 x2
x1
Slope7.3 3
5 2.1
4.3
2.91.4 gmL
RISE
RUN
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References Pearson Prentice Hall,
Focus of Physical Science, Textbook
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