
7.4.1-Explore Graphing Proportional Relationships
Presentation
•
Mathematics
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7th Grade
•
Medium
+6
Standards-aligned
Jessica Freeman
Used 8+ times
FREE Resource
15 Slides • 22 Questions
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Multiple Choice
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Multiple Choice
4
Multiple Choice
5
Multiple Choice
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Multiple Choice
7
Multiple Choice
8
Multiple Choice
9
Multiple Choice
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Properties of Proportional Graphs
All graphs of proportional relationships are represented with a straight line to show a constant rate also known as LINEAR.
All proportional relationships pass through the origin.
Can be used to calculate the unit rate or constant of proportionality.
17
Multiple Choice
The graph represents the number of laps a car drove around a track compared to the number of minutes.
How many laps did the car do in 6 minutes?
(Click the graph to enlarge the image.)
2 laps
6 laps
4 laps
9 laps
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Calculating Unit Rate from a Proportional Graph
We can use individual points on the line to calculate the unit rate...
We just need to remember to create a ratio and divide.
19
Multiple Choice
What is the unit rate in miles per hour for this proportional relationship?
(Click the graph to enlarge the image.)
60 miles per hour
120 miles per 2 hours
1 mile per hour
60 miles per 2 hours
20
Multiple Choice
What is the constant of proportionality (unit rate) of the speed of the sloth based on the graph?
(Click the graph to enlarge the image.)
1 minute per 6 feet
6 feet per minute
1 minute per 3 feet
3 feet per minute
21
Multiple Choice
The graph above shows the price of games in dollars. Is the graph proportional and how do you know?
(Click the graph to enlarge the picture.)
The graph is proportional because it is a straight line.
The graph is proportional because it is a straight line that passes through the origin.
The graph is not proportional because it does not pass through the origin.
The graph is not proportional because it is not a straight line and it does not pass through the origin.
22
Multiple Choice
The graph represents the number of words Taylor can type over a certain number of minutes. Which of the following statements is true?
(Click the graph to enlarge the image.)
Taylor can write 6 words per minute
Taylor can write 25 words per minute
Taylor can write 50 words per minute
Taylor can write 150 words per minute
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Multiple Choice
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Multiple Choice
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Look at the crosshairs.
k = y/x
y = k(x)
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Writing Equations (y = kx) from Graphs
Look for the point where x = 1. This is the k value!! (unit rate)
You can use any point (x,y) on the graph and divide y/x.
Write the equation in the form y = kx.
28
Multiple Choice
Which equation represents the proportional graph?
(Click on the graph to make it bigger)y = 21x
y = 4x
y = 2x
y = 41x
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Multiple Select
Select ALL of the graphs that could represent a proportional relationship.
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Constant of proportionality from graphs
What are two different ways you can find a constant of proportionality using a graph?
Look at x=1 on the line to find what y equals...that is your constant.
Pick any clear point. Divide y by x.
31
Open Ended
What does the point (4, 60) on the graph represent?
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Poll
What is the constant of proportionality?
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1/15
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1/20
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Open Ended
If I wanted to know how many hours it would take Damon to bike 72 miles, what would I do?
34
Multiple Choice
How long would it take Damon to bike 72 miles?
5.8 hours
0.21 hours
4.8 hours
0.48 hours
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Multiple Choice
What is the equation of this graph?
y = kx
y = 15x
y = x/15
y = k/x
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