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- 1. Lesson 32: Multi-Step Problems in the Real World Date: 5/16/14 338 Β© 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6β’4Lesson 32 ππ ππ ππ ππ ππ π Number of Packages Beverages for the Party π π π π π π π TotalNumberofBeverages Lesson 32: Multi-Step Problems in the Real World Student Outcomes ο§ Students analyze an equation in two variables, choose an independent variable and a dependent variable, make a table and make a graph for the equation by plotting the points in the table. For the graph, the independent variable is usually represented by the horizontal axis and the dependent variable is usually represented by the vertical axis. Classwork Opening Exercise (5 minutes) Opening Exercise Xin is buying beverages for a party which are individually packaged and come in packs of π. Let π be the number of packages Xin buys and π be the total number of beverages. The equation π = ππ can be used to calculate the total number of beverages when the number of packages is known. Determine the independent and dependent variable in this scenario. Then make a table using whole number values of π less than π. The independent variable is the number of packages. I know this because I can use the equation to determine the number of beverages. Therefore, the number of individual beverages depends on the number of packages purchased. The dependent variable is the total number of beverages because this is affected by the number of packages changing. # of Packages (π) Total Number of Beverages (π = ππ) π π π π π ππ π ππ π ππ π ππ Example 1 (7 minutes) Example 1 Make a graph for the table in the Opening Exercise.
- 2. Lesson 32: Multi-Step Problems in the Real World Date: 5/16/14 339 Β© 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6β’4Lesson 32 πππ πππ πππ ππ πππ # of Hours π π π π π π NumberofMiles Road Trip ο§ To make a graph, we must determine which variable is measured along the horizontal axis and which variable is measured along the vertical axis. ο§ Generally, the independent variable is measured along the π₯-axis. Which axis is the π₯-axis? οΊ The π₯-axis is the horizontal axis. ο§ Where would you put the dependent variable? οΊ On the π¦-axis, it travels vertically, or up and down. ο§ We want to show how the number of beverages changes when the number of packages changes. To check that you have set up your graph correctly, try making a sentence out of the labels on the axis. Write your sentence using the label from the π¦-axis first followed by the label from the π₯-axis. βThe number of beverages depends on the number of packages purchased.β Example 2 (3 minutes) Example 2 Use the graph to determine which variable is the independent variable and which is the dependent variable. Then state the relationship between the quantities represented by the variables. The number of miles driven depends on how many hours they drive. Therefore, the number of miles is the dependent variable and the number of hours is the independent variable. This graph shows that they can travel ππ miles every hour. So, the total number of miles driven increases by ππ every time the number of hours increases by π. MP.2
- 3. Lesson 32: Multi-Step Problems in the Real World Date: 5/16/14 340 Β© 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6β’4Lesson 32 # of weeks #ofbooks Exercises (20 minutes) Students work individually. Exercises 1. Each week Quentin earns $ππ. If he saves this money, create a graph that shows the total amount of money Quentin has saved from week π through week π. Write an equation that represents the relationship between the number of weeks that Quentin has saved his money (π) and the total amount of money he has saved (π). Then name the independent and dependent variable. Write a sentence that shows this relationship. π = πππ π is the dependent variable and π is the independent variable. # of Weeks Total Saved ($) π ππ π ππ π ππ π πππ π πππ π πππ π πππ π πππ 2. Zoe is collecting books to donate. She started with π and collects two more each week. She is using the equation π = ππ + π, where π is the total number of books collected and π is the number of weeks she has been collecting. Name the independent and dependent variables. Then create a graph to represent how many books Zoe has collected when π is π or less. The number of weeks is independent. The number of books collected is dependent. # of Weeks # of Books Collected π π π π π π π π π ππ π ππ π π π π π π π π π π # of Weeks πππ πππ πππ πππ πππ ππ ππ ππ Money Saved AmountofMoney($)
- 4. Lesson 32: Multi-Step Problems in the Real World Date: 5/16/14 341 Β© 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6β’4Lesson 32 Total Cost of Ride NumberofMiles 3. Eliana plans to visit the fair. She must pay $π to enter the fair grounds and an additional $π per ride. Write an equation to show the relationship between π, the number of rides, and π, the total cost. State which variable is dependent and which is independent. Then create a graph that models the equation. π = ππ + π The number of rides is the independent variable and the total cost is the dependent variable. # of Rides Total Cost (in dollars) π π π π π ππ π ππ π ππ Closing (5 minutes) ο§ Imagine that you are helping a friend with his math work. Here is the problem he was solving: Henry is taking a taxi cab home. The cab company charges an initial fee of $5 plus $2 for each additional mile. Henry uses the equation π‘ = 2π + 5 to calculate the cost of the ride, where π‘ is the total cost and π is the number of miles. Your friend states that π‘ is the dependent variable and π is the independent variable. Then the friend starts to sketch a graph. ο§ What would you tell your friend when looking over his/her work? οΊ I would tell my friend that the dependent variable should go on the vertical axis. Then your graph will show that the total cost of the ride depends on how many miles you travel in the taxi cab. Exit Ticket (5 minutes)
- 5. Lesson 32: Multi-Step Problems in the Real World Date: 5/16/14 342 Β© 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6β’4Lesson 32 Name Date Lesson 32: Multistep Problems in the Real World Exit Ticket Determine which variable is the independent variable and the dependent variable. Write an equation, make a table and plot the points from the table on the graph. Enoch can type 40 words per minute. Let π€ be the number of words and π be the number of minutes. Independent variable Dependent variable Equation
- 6. Lesson 32: Multi-Step Problems in the Real World Date: 5/16/14 343 Β© 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6β’4Lesson 32 Exit Ticket Sample Solutions Determine which variable is the independent variable and the dependent variable. Write an equation, make a table and plot the points from the table on the graph. Enoch can type ππ words per minutes. Let π be the number of words and π be the number of minutes. The independent variable is the number of minutes. The dependent variable is the number of words. The equation is π = πππ. # of Minutes # of Words π π π ππ π ππ π πππ π πππ π πππ Problem Set Sample Solutions 1. Caleb started saving money in a cookie jar. He started with $ππ. He adds $ππ to the account each week. Write an equation where π is the number of weeks and π is the total amount in the account. Determine which variable is independent and which is dependent. Then graph the total amount in the account for π being less than π weeks. π = πππ + ππ π is the dependent variable. π is the independent variable. # of Weeks Total Amount in Account (in dollars) π ππ π ππ π ππ π ππ π ππ π ππ ππ ππ π π π π π π π # of Minutes πππ πππ πππ πππ Words typed per Minute #ofWordsTyped TotalAmountinAccount(indollars) # of weeks Money in Savings Account
- 7. Lesson 32: Multi-Step Problems in the Real World Date: 5/16/14 344 Β© 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6β’4Lesson 32 # of weeks TotalAmount($) Total Amount Saved 2. Kevin is taking a taxi from the airport to his home. There is a $π flat fee for riding in the taxi. In addition, Kevin must also pay $π per mile. Write an equation where π is the number of miles and π is the total cost of the taxi ride. Determine which variable is independent and which is dependent. Then graph the total cost for π being less than π miles. π = ππ + π π is the dependent variable. π is the independent variable. # of Miles Total Cost π π π π π π π π π ππ π ππ 3. Anna started with $ππ. She saved an additional $π each week. Write an equation that can be used to determine the total amount saved, π, after a given number of weeks, π. Determine which variable is independent and which is dependent. Then graph the total amount saved for first π weeks. π = ππ + ππ π is the dependent variable. π is the independent variable. # of Weeks Total Amount ($) π ππ π ππ π ππ π ππ π ππ π ππ π ππ π ππ π ππ TotalCost($) Total Cost of a Taxi Ride Number of Miles
- 8. Lesson 32: Multi-Step Problems in the Real World Date: 5/16/14 345 Β© 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6β’4Lesson 32 4. Aliyah is purchasing produce at the farmersβ market. She plans to buy $ππ worth of potatoes and some apples. The apples cost $π. ππ per pound. Write an equation to show the total cost of the produce, where π» is the total cost and π is the number of pounds of apples. Determine which variable is dependent and independent. Then graph the equation on the coordinate plane. π» = π. πππ + ππ The total cost is the dependent variable. The number of pounds of apples is the independent variable. # of Pounds of Apples Total Cost ($) 0 10 π ππ. ππ π ππ π ππ. ππ π ππ π ππ. ππ # of lb. of apples Total Cost at the Farmersβ Market TotalCost($)