Unit 5. Day 7. Groups Example A: Grandmas special chocolate chip cookie recipe, which yields dozen cookies, calls for cups of flour. Example A: Grandmas special chocolate chip cookie recipe, which yields dozen cookies, calls for cups of flour. Example A: Grandmas special chocolate chip cookie recipe, which yields dozen cookies, calls for cups of flour.
12 minutes dozen cookies / cups of flour. 3 6 9
Number of dozens of cookies 4 8 12 Create a table comparing the amount of flour used to the amount of cookies. dozen cookies / cups of flour.
Number of dozens of cookies 3 6 9 4 8
12 4 3 4 13 proportional 4
38 16 4 3 12 19 Is the number of cookies proportional to the amount of flour used? Explain why or why not .
dozen cookies / cups of flour. 4 3 1 1 1 3 1
dozen cookies (16 cookies) can be made using 1 cup of flour. What is the unit rate of cookies to flour , and what is the meaning in the context of the problem? Cups of flour Number of dozens of cookies
3 6 9 4 8 12
4 3 1 Model the relationship on a graph. 1 1 3
1 The points appear on a line that passes through the origin (0, 0) Does the graph show the two quantities being
proportional to each other? Explain. 4 3 1 Cups of
flour Number of dozens of cookies 3 6
9 4 8 12 Write an equation that can be used to represent the relationship. 4 = 3
Example A: Example B: 6 minutes Example B: Below is a graph modeling the amount of sugar required to make Grandmas special chocolate chip cookies. a) Record the coordinates from the graph. What do these ordered pairs represent?
( 0, 0 ) 0 cups of sugar will result in 0 dozen cookies ( 2, 3 ) 2 cups of sugar will result in 3 dozen cookies ( 4, 6 ) 4 cups of sugar will result in 6 dozen cookies
( 8, 12 ) 8 cups of sugar will result in 12 dozen cookies ( 12,18 ) 12 cups of sugar will result in 18 dozen cookies ( 16,24 ) 16 cups of sugar will result in 24 dozen cookies b) Grandma has remaining cup of sugar. How many dozen cookies will she be able to make? Plot the point on the graph above
1(,1.5 ) b) How many dozen cookies can Grandma make if she has no sugar? Can you graph this on the coordinate plane provided above? What do we call this point? 0 ,)0 ( The origin
Example A: Example B: Example C: 6 minutes Example C: The graph below shows the amount of time a person can shower with a certain amount of water.
a) Can you determine by looking at the graph whether the length of the shower is proportional to the number of gallons of water? Explain how you know Yes, the quantities are proportional to each other since all points lie on a line that passes through the origin (0, 0). b) How long can a person shower with gallons of water? 5 minutes How long can a person shower with gallons of water? 20 minutes
c) What are the coordinates of point ? (30, 10) Describe point in the context of the problem? If there are 30 gallons of water, then a person can shower for 10 minutes d) Can you use the graph to identify the unit rate? 15
5 15 15 Too small to tell 5 1 15 3
1 e) Write the equation to represent the relationship between the number of gallons of water used and the length of a shower. 1 3 1
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