Constant of Proportionality, Proportional Relationships and Unit Rate

Select all graphs that represent proportional relationships.

• 
• 

Write an equation for this relationship.

• y=1/5x

• y=1/2x

• y=2x

• y=5x

What is the unit rate in this proportional relationship?

• 60 miles/1 hour

• 120 miles/ 2 hours

• 1 mile/ 1 hour

The cost of 4 pounds of grapes is $24.36. What is the constant of proportionality that relates cost in dollars, y, to the number of pounds of grapes, x?

• 6.09

• 20.36

• 8.12

• 28.36

What is the unit rate in this proportional relationship?

• 60 miles/1 hour

• 120 miles/ 2 hours

• 1 mile/ 1 hour

Which statement best describes the relationship between x and y in the table?

• Proportional

• Not Proportional

What is the constant of proportionality?

• 15

• 5

• 75

• 25

Which equation matches the graph?

• y = 8x

• y = 1x

• y = 3x

• y = 16x

Why does this graph show a non-proportional relationship?

• Because it is proportional

• It goes through the origin

• It does not go through the origin

• It is a straight line

A machine packs boxes at a constant rate of 2/3 a box every 1/2 a minute.  What is the number of boxes it packs per minute?

• 1/3

• 3/4

• 7/6

• 4/3