Constant Proportionality from Tables
Constant of Proportionality from Graphs
Constant of Proportionality from Words (cross multiply and divide)
Constant of Proportionality and Equations
100
Drew paints portraits. Find the constant of proportionality if it is a proportional relationship (with correct units!)
Number of portraits = x Time (in hours) = y
1 5
2 10
3 15
4 20
5 portraits per hour
100
Find the constant of proportionality
k =46
100
Morgan bought 24 batteries packed in 6 equal packs. Find the number of batteries in one pack (batteries per pack)?
4 batteries per pack
100
Find the constant of proportionality: y = 7x
What is 7?
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
k = 4
200
What is the unit rate?
1.2
200
If 12 eggs cost $3.84, then what is the cost of one egg?
$0.32
200
Find the constant of proportionality: y = (2/3)x
K = 2/3?
300
Fred wrote notes during an exam. Is this a proportional relationship?
Notes (pages) 8 9 10 11
Time (in hours) 16 18 20 23
No, it is not proportional; there is no k.
300
Find the constant of proportionality with correct units
5 gallons per min
300
A car travels 225 miles in 3 hours? What is the unit rate in miles per hour?
75 mph
300
What is the constant of proportionality in the following equation?
y = 4x
The constant of proportionality is 4
400
A ferry transports bikes to an island. What is K?
Number of bikes (x) 10 12 14
Number of trips (y) 5 6 7
K = 0.5
400
What is the constant of proportionality?
K = 3
400
If 7 necklaces cost $84, how much would it be for 15 necklaces?
$180
400
Which equation shows a proportional relationship?
a) y = 2 + x
b) y = 2x
c) y = 2x + 5
d) y = 2x - 5
b) y = 2x
500
Alice bought comics. Is the table a proportional relationship?
Number of comics 2 4 6
Price (dollars) 6 12 16
No, it is not proportional; there is no k.
500
Find the constant of proportionality with correct units
60 miles per hour
500
12 sodas cost $6.84. How much would it cost for 18 sodas?
$10.26
500
What is the equation for the following?
A car travels 325 miles in 5 hours at a constant speed.
y = 65x