Finding the Constant of Proportionality
Writing an Equation in the form y=kx
Interpreting Proportional Graphs
Comparing Proportional Relationships
Random
100
What's the constant of proportionality?
k=5
100
Jude sends 45 E-mails in 15 minutes.
Write an equation to represent the relationship between emails y and minutes x
y=3x
100
What information is on the horizontal axis?
Time in hours
100
Store A sells 3 slices of pizza for $9. Store B sells 4 slices of pizza for $16. Which store has the better rate and what is it?
Store A. $3/slice
100
Who is this?
1,920 × 1,080
Justin Herbert, former Eugene 4J Spanish Immersion student
200
What is the constant of proportionality? Write your answer as a rate
$1.50 per ticket
k=1.50
200
Lenasia earned $640 in a 40-hour work week.
Write an equation to represent the relationship between total money (y) and hours (x)
y=16x
200
What information is on the vertical axis?
Number of wheels
200
Isaac and Neema are running a race. Isaac runs 5 meters per second. Neema runs 8 meters per second. If the race is 400 meters, who will finish first and what will their time be?
Neema with a time of 50 seconds
200
What is the official nickname of Eugene?
Track Town, USA
300
What's the constant of proportionality? Write your answer as a rate.
46 miles per hour
300
Write an equation in the form y=kx 
y=15x
300
Does this graph represent a proportional relationship between cost and tickets? Explain.
No. There is not a constant multiplier between cost and tickets. The graph does not go through the origin.
300
The graphs shows the elevation of two different helicopters after a given number of seconds. Which helicopter is ascending more quickly? Explain. 
Helicopter A. After 6 seconds, Helicopter A is 15 meters high, but in the same amount of time, Helicopter B is only 8 meters high.
300
What is the name of the hill in this picture?
Spencer Butte in a photo taken from Skinner Butte
400
Don't forget to include units
5 gallons per minute
400
The table represents the relationship between slices of pizza and their total cost.
y=2.5x
400
What does this point represent?
35 gallons of water are used in 7 minutes
400
Blet Soe rides his bike 60 miles in 4 hours. Ruth's rate on her bike is expressed by the equation y=12.5x. How long would it take each person to ride 100 miles.
Blet Soe would take 6 hours and 40 minutes (6 2/3 hour). Ruth would take 8 hours.
400
What kind of tree is this?
Douglas Fir, State Tree of Oregon
500
What is the constant of proportionality. Give your answer as a rate.
2/3 lap per minute
500
y=1/5x
500
What is the cost per ticket?
$2/ticket
500
The table and graph show the fuel efficiency for two different cars. Which is more efficient and why?
Car A. It uses 25 miles per gallon whereas Car B uses 22 miles per gallon.
500
These musicians both went to South Eugene High School. Name one for full points, or name both for an extra 100.
Michelle Zauner/Japanese Breakfast or Mat Kearney