The Constant of Proportionality (a.k.a: the unit rate)

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Presentation transcript:

The Constant of Proportionality (a.k.a: the unit rate)

Example 1: After school, Brandon told his Mom that he had volunteered to make cookies for the school’s Bake Sale. He planned to make 3 cookies for each of the 96 students in 7 th grade. Brandon’s Mom told him that he could bake 36 cookies on two cookie sheets. 1a. Is the number of cookies baked proportional to the number of cookie sheets used? Complete the table below to organize the information. # of cookie sheets # of cookies baked # of cookie sheets This is a proportional relationship. The unit rate is 18 cookies per sheet. The constant of proportionality is /8 = 18 cookies per sheet 47272/4 = 18 cookies per sheet 23636/2 = 18 cookies per sheet

1b. How many cookies does Brandon need to bake for the Bake Sale? 1c. It took 2 hours to bake 8 sheets of cookies. If Brandon and his Mom start baking at 4:00 p.m., when will they finish baking cookies? 96 students ( 3 cookies per student) =288 cookies 288 cookies. 18 cookies per sheet =16 sheets of cookies needed If it took 2 hours to bake 8 sheets of cookies, it will take 4 hours to bake 16 sheets of cookies. They will finish baking at 8 p.m.

2a. If each of the games costs the same amount of money, what is the constant of proportionality between the money spent and the number of games played? Complete the table below to organize the information. # of games Money spent ($) Money spent # of games Example 2: Last week, Lenny spent $18 to bowl 4 games. This week, he spent $27 to bowl 6 games. Lenny owns his own bowling ball and shoes, so he only has to pay for each game that he bowls. The unit rate is $4.50 per game. The constant of proportionality is $18/4 = $4.50 per game 627$27/6 = $4.50 per game

2b. If Lenny bowls 9 games in the tournament next weekend, how much will he have to pay? Total amount spent = (cost per game) (number of games) Total amount spent = (4.50) (9) Total amount spent = $40.50