Directly Proportional

What is the constant of proportionality that relates fuel in gallons used to the distance in miles?

• A

• B

• C

• D

Which of the following is the equation used to write a directly proportional relationship?

• y = x/k

• y = kx

• x = y//k

Based on the data in the graph, how many cookies can be purchased with $5?

• $0.50 per cookie

• 3 cookies for $1.50

• 2.5

• 10

Which statement below accurately represents the graph?

• $100 is earned for each hour worked

• $200 earned for every 2 hours worked
  is the unit rate

• $500 is earned for every 8 hours worked

• $250 is earned after working 3 hours

The cost of apples varies directly with the number of pounds purchased. Using the table, find the unit price.

• $3.36/pound

• $1.68/pound

Based on this graph, which of the following are true? Select all that apply.

• This graph is a proportional relationship because it is linear and reaches (0,0).

• The unit rate is 10 meters per second.

• The direct variation equation is y = 10x.

• According to this graph, the object would travel 60 meters in 60 seconds.

Which statements are true about the data in the tables?

• A is not proportional but B is

• both pass through (0,0)

• y = 3x is the equation for table A

• y = 4x is the equation for table B

• if graphed, these tables would make the same line

Is the data in the table proportional or non-proportional?

• Proportional

• Non-Proportional

What is the unit rate/constant of proportionality?

• 80 hours per mile

• 40 hours per mile

• 40 miles per hour

• 0.025 miles per hour

Which equation matches the graph?

• y = 7x

• y = 42x

• y = 6x

• y = 2x