Pre Algebra Lesson 9 1
Transcript of Pre Algebra Lesson 9 1
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Ratios and Rates
Goals: In this lesson, youll write
ratios as fractions in simplest formand determine unit rates.
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5-Minute Check
1. Determine the domain and range of therelation {(-1,2), (-3,4), (2,2), (-3,2)}. Is therelation a function?
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5-Minute Check
1. Determine the domain and range of therelation {(-1,2), (-3,4), (2,2), (-3,2)}. Is therelation a function?
D = {-3,-1,2}; R = {2,4}; no
2.
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5-Minute Check
1. Determine the domain and range of therelation {(-1,2), (-3,4), (2,2), (-3,2)}. Is therelation a function?
D = {-3,-1,2}; R = {2,4}; no
2. Find the slope of the line that containsA(3,5) and B(-2,-6).
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5-Minute Check
1. Determine the domain and range of therelation {(-1,2), (-3,4), (2,2), (-3,2)}. Is therelation a function?
D = {-3,-1,2}; R = {2,4}; no
2. Find the slope of the line that containsA(3,5) and B(-2,-6).
11/5
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5-Minute Check
Graph each equation or inequality.
3. y = 3x1
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5-Minute Check
Graph each equation or inequality.
3. y = 3x1
Markings should be placedon coordinates (1,2) and(0,-1). A line should bemade going across them,extending in bothdirections.
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5-Minute Check
4. x + y > 6
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5-Minute Check
4. x + y > 6
A dotted line shouldgo across +6 on boththe y-axis, and onthe x-axis.
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5-Minute Check
4. x + y > 6
A dotted line shouldgo across +6 on boththe y-axis, and onthe x-axis.
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5-Minute Check
4. x + y > 6
A dotted line shouldgo across +6 on boththe y-axis, and onthe x-axis. Then, theoutside of that lineshould be shaded.
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Ratios and Rates
Example 1.
Many grocery stores list the unit price ofitems on the shelf tag so that customersmay compare similar items. The cost of a12-ounce box of Cheerios is $3.29. a storebrand cereal that is similar to Cheerios
costs $4.89 for an 18-ounce box. Whichcereal has a lower per-ounce cost?
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Ratios and Rates
Cheerios
329cents/12(ounces) =
Store Brand
489cents/18(ounces) =
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Ratios and Rates
Cheerios
329cents/12(ounces) = 27.417
Store Brand
489cents/18(ounces) = 27.167
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Ratios and Rates
The cost is about 27.4 cents per ounce forCheerios. The store brand is about 27.2
cents per ounce.
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Ratios and Rates
The cost is about 27.4 cents per ounce forCheerios. The store brand is about 27.2
cents per ounce.So the store brand is less
expensive per ounce.
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Ratios and Rates
What is the difference between ratio and
rate?
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Ratios and Rates
Write a ratio that compares the number ofstudents in your school to the number of
teachers. Then express this ratio as a unit
rate.
Animas High has 10 teachers
Animas High has 96 students
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Ratios and Rates
Describe and give an example of a unit rate.
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Ratios and Rates
Express each ratio as a unit rate.
1. 12 pounds lost in 5 weeks
2. $2.29 for a 6 pack of cola3. 99 for a dozen
4. 6 inches of rain in 24 hours
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Ratios and Rates
Assignment: 1632 E, 3346 A