Presentation on theme: "Proportional and Nonproportional Relationships"— Presentation transcript:
1Proportional and Nonproportional Relationships 7th Grade MathLesson Objective:Students will identify proportional and nonproportional relationships.
2Vocabulary Proportional Nonproportional Two quantities that have a constant ratioExample:NonproportionalTwo quantities that do NOT have a constant ratio16 = 1617 ≠ 20
3Identifying Proportional Relationships - Tables Kudzu is a vine that grows an average of 7.5 feet every 5 days. Is the number of days of growth proportional to the length of the vine as measured on the last day?Length7.51522.530# of Days51020Yes
4Identifying Proportional Relationships - Tables The Vista Marina rents boats for $25 per hour. In addition to the rental fee, there is a $12 charge for fuel. Is the number of hours you can rent the boat proportional to the total cost?Total Cost376287112Hours1234No
5Identifying Proportional Relationships – Cross Products Ms. Cochran is planning a year-end pizza party for her students. Ace Pizza offers free delivery and charges $8 for each medium pizza. Is the cost of an order proportional to the number of pizzas ordered?16 = 16Yes
6Identifying Proportional Relationships – Cross Products Uptown Pizzeria sells medium pizzas for $7 each but charges a $3 delivery fee per order. Is the cost of an order proportional to the number of pizzas ordered?17 ≠ 20No