Lesson 5: Identifying Proportional and Non-Proportional Relationships in Tables Bellringer
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1 Lesson 5: Identifying Proportional and Non-Proportional Relationships in Tables Bellringer 1) What is the greatest common factor of 132 and 77? a. 1 b. 7 c. 11 d. 12 2) Nick can run 9.3 miles in a. 3.1 mph b. 6.2 mph c mph d. 9 mph 1 1 hours. What is his rate in miles per hour? 2
2 Lesson 5: Identifying Proportional and Non-Proportional Relationships in Tables Notes REVIEW: One quantity is proportional to a second if a constant (number), k, exists such that each measure in the first quantity,x, multiplied by this constant gives the corresponding measure in the second quantity,y. y kx 0 Calories burned while Jumping Rope Is the number of Calories burned proportional to time? How do you know? Time (minutes) Calories Burned Steps to determine if two quantities in a table are proportional to each other: 1) For each given measure of Quantity X (independent variable) and Quantity Y (dependent variable), find the value of Y X. 2) If the value of Y is the same for each pair of numbers, then the quantities are proportional to each other. X Example: You have been hired by your neighbors to babysit their children on Friday night. You are paid $8 per hour. Complete the table relating your pay to the number of hours you worked. Hours Worked (X) Pay (Y) ½ 5 6 Based on the table above, is pay proportional to hours worked? How do you know? How much would you get paid if you worked for 16 hours? for 23 hours? 1 3
3 For Examples 1 3, determine if y is proportional to x. Justify your answer. 1. The table below represents the amount of snow fall in 5 counties (in inches) to hours of a recent winter storm. x Time (hrs) y Snowfall (In) The table below shows the relationship between cost of renting a movie to the number of days on rent. x Number of Days y Cost You Try! 3. The table below shows the relationship between the amount of candy (pounds) bought and the total cost. x Pounds y Cost Example 4: 4. Randy is planning to drive from New Jersey to Florida. Randy recorded the distance traveled and the total number of gallons used every time he stopped for gas. Assume miles driven is proportional to Gallons Consumed in order to complete the table. Gallons Consumed Miles Driven
4 You Try! Example 5: Summer Job Alex spent the summer helping out at his family s business. He was hoping to earn enough money to buy a new $220 gaming system by the end of the summer. Halfway through the summer, after working for 4 weeks, he had earned $112. Alex wonders, If I continue to work and earn money at this rate, will I have enough money to buy the gaming system by the end of the summer? To check his assumption, he decided to make a table. He entered his total money earned at the end of week 1 and his total money earned at the end of Week 4. Week Total Earnings $28 $112 a. Using the values given, are Alex s total earnings proportional to the number of weeks he worked? How do you know? b. Work with a partner to answer Alex s question. Lesson Summary:
5 Homework: In each table determine if y is proportional to x and if so state the constant unit rate. 1. x y x y x y Kayla made observations about the selling price of a new brand of coffee that sold in three different sized bags. She recorded those observations in the following table: Ounces of Coffee Price in Dollars $2.10 $2.80 $5.60 Is the price proportional to the amount of coffee? Why or why not? Use the relationship to predict the cost of a 20 oz. bag of coffee? 5. The table shows the relationship between the number of parents in a household and the number of children in the same household. Is the number of children proportional to the number of parents in the household? Explain why or why not. Number of Parents Number of Children You and your friends go to the movies. The cost of admission is $9.50 per person. Create a table showing the relationship between number of people going to the movies and the total cost of admission.
6 Lesson 5: Identifying Proportional and Non- Proportional Relationships in Tables Exit Ticket The table below shows the price for the number of roses indicated. Number of Roses Price (Dollars) a. Is the price proportional to the number of roses? How do you know? b. Find the cost of purchasing 30 roses.
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