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Walk the Graph
Caroline Woodason
8th grade
North Whitfield Middle School
Whitfield County Schools
Task
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Overview
In this task, students will use CBR™ motion detectors to create real-time graphs displaying lines with positive, negative, and zero slopes.
Illustrative Task
Eddie’s teacher used a motion detector hooked to an overhead graphing calculator to show graphs of how far Eddie was from the motion detector for a few seconds. Eddie was asked to walk in such a way as to produce graphs with certain characteristics. Explain how Eddie needs to walk to produce a graph which is:
- A line with a negative slope.
- A line with a positive slope.
- A line with a steeper slope than the one in part (2).
- A horizontal line.
- Not a line.
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GPS Addressed
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M8A4. Students will graph and analyze graphs of linear equations and inequalities.
a. Interpret slope as a rate of change.
b. Determine the meaning of the slope and y-intercept in a given situation.
c. Graph equations of the form y = mx + b.
d. Graph equations of the form ax + by = c.
f. Determine the equation of a line given a graph, numerical information that defines the line or a context involving a linear relationship.
g. Solve problems involving linear relationships.
M8D4. Students will organize, interpret, and make inferences from statistical data.
a. Gather data that can be modeled with a linear function.
b. Estimate and determine a line of best fit from a scatter plot.
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Video Information
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Use these questions to guide your thinking about some of the important teacher ideas in the lesson featured in the video clip.
- What kinds of questions does the teacher ask to promote students’ problem solving?
- How is the teacher gauging students’ current understandings and building from those understandings?
- Consider the GPS standards listed with this video.
- What makes this lesson different from lessons you have taught on this topic?
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