Constant Proportionality from Tables
Constant of Proportionality from Graphs
Constant of Proportionality from Words
Constant of Proportionality and Equations
COP requirements
100

Drew paints portraits.  Find the constant of proportionality if it is a proportional relationship 

Time (in hours) = x             Number of portraits = y

           1                                          5

           2                                          10

           3                                          15

           4                                          20


5 portraits per hour

100

Find the constant of proportionality and what does it mean?

46 miles per hour

100

Morgan bought 24 batteries packed in 6 equal packs. What is the unit rate per pack?

4 batteries per pack

100

Find the constant of proportionality: y = 7x

k = 7

100

What is k mean in y=kx?

constant of proportionality

200

The table shows the amount earned by Harry for selling ice cream.  Find k.


Cups Sold = x              3         5        7         9

Earnings ($)  = y         12        20      28       36


CoP = 4

200

What isthe constant of proportionality and what does it mean?

1.2 miles per hour

200


Julie brought 5 pounds of cans to a recycling place and was paid $2. Find the constant of proportionality (cost per pound)?

$0.40/pound

200

Find the constant of proportionality:

C = 2/3 m

k = 2/3

200

When you are looking at a graph, how can you tell if it is proportional?

A straight line through the origin

300

Fred wrote notes during an exam.  Find the CoP (with correct units) if it is a proportional relationship.


Notes (pages)        8             9               10            11

Time (in hours)      18           19              20            21

It is not proportional, there is no CoP. 

300

How would you write the constant of proportionality as an ordered pair?

( 1 , 5 )

300

To make juice, Michael combines 4 liters of water and 12 scoops of juice mix. How many scoops does Michael need with 9 liters of water?

27 scoops

300

Lia earns $39 for 3 hours of babysitting. There is a proportional relationship between the number of hours lia babysits, x, and the total amount of money she earns, y. What is the proportional relationsip equation?


y=13x

300

what is another word for constant of proportionality?

unit rate

400

A ferry transports bikes to an island.  Write k (which is the CoP). 


Number of bikes (x)              10             12             14            

Number of trips (y)              5                6               7              

k = 0.5

400

What does point (2 , 6) on the graph?

 

6 gallons of water in 2 mins

400

Zachary's time machine needs 14 megawatts of electricity to travel back 7 years.  How many megawatts does Zachary need to travel back 15 years?

 30 megawatts

400

William has a farm of hens. The number of eggs laid by the hens can be determined by the equation E=3h, where E is the number of eggs and h is the number of hens. Use the equation to find how many eggs can 27 hens lay.  

81 EGGS

400

How do you find k (Constant of Proportionality)?


 y/x 

y divide by x

500

Alice bought comics.  Find the k (CoP with correct units) if the table shows a proportional relationship.


Number of comics             2             4             6            

Price (dollars)                   6            12            18           


k = 3 dollars per comic

500

What does point (4 , 240) mean?

The family travels 240 miles in 4 hours

500

Jasmine bought 32 kiwi fruit for $16 Tuesday and 8 kiwi fruit for $4 Friday. How much does Jasmine need to buy 54 kiwi fruit?

 $27

500

In a pizza shop, the number of pizzas prepared can be determined by the equation P=0.30c. Where P is the number of pizzas and c is the number of cups of cheese used. Use the equation to find how many cups of cheese is used to make 39 pizzas.

130 cups of cheese

500
what is the x and y value (x,y) for a point at the origin?

(0,0)

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