8.2 Double Line Graphs
8.4 Double Bar Graphs
Here you’ll learn how to construct and interpret double line graphs and how to use double line graphs to solve
problems.
You’ve just started a new job. Every day you get paid $75 for the first hour you work and then $15 an hour for each
subsequent hour. Your friend was hired for a different rate of pay. He gets $35 for the first hour he works and then
$25 an hour for each subsequent hour. Who gets paid the most money after 6 hours? What about after 10 hours?
Watch This
First watch this video to learn about double line graphs.
MEDIA
Click image to the left for more content.CK-12 Foundation: Chapter8DoubleLineGraphsA
Then watch this video to see some examples.
MEDIA
Click image to the left for more content.CK-12 Foundation: Chapter8DoubleLineGraphsB
Guidance
Remember a line graph, by definition, can be the result of a linear function or can simply be a graph of plotted points,
where the points are joined together by line segments. Line graphs that are linear functions are normally in the form
y=mx+b, wheremis the slope andbis they-intercept. The graph below is an example of a linear equation with a
slope of^23 and ay-intercept of−2: