Proportional Relationships

Which number represents k, or the constant of proportionality? (HINT: k= y/x y= words typed, x= minutes)

• 120

• 60

• 12

• 40

What number should replace the ? in the table?

• 200

• 260

• 240

• 250

Kenny is practicing for a typing test to obtain a job as a paralegal. The number of words he can type is proportional to the number of minutes. If the test is 18 minutes long how many words will Kenny be able to type? (HINT: y=kx y=words typed, k=rate, x=minutes typing)

• 720 words

• 360

• 200

• 1,180

If Kenny types 280 words, how many minutes did he type for? (HINT: y=kx y=words typed, x=minutes, k=rate)

• 7

• 5

• 6

• 4

Answer explanation

y=kx y=280 k=40

280=40x

x=280/40

During the fall a pumpkin patch advertises 4 pumpkins for $11.00. Which equation below represents the price per pumpkin?

• y=0.36x

• y=2.75x

• 11y=4x

The table below shows the relationship between the number of miles traveled= X, and the number of gallons used= Y. Which equations best represents the relationship?

• y=7.6x

• y=684x

• y=0.13x

• y=76x

A graph that shows a proportional relationship must

• Be in a straight line

• Have arrows on each end

• Pass through the origin (0,0)

• Not go over 100

This graph shows a proportional relationship

• True

• False

This graph shows a proportional relationship

• True

• False

This graph shows a proportional relationship

• True

• False