Constant of Variation Introduction

Identify the constant of proportionality.

• k = 2

• k = 3

• k = 1.50

• k = 2/3

• none (not proportional)

What is the constant of proportionality?

• 3

• 4

• 2

• 5

Is this table proportional or non-proportional?

• Yes

• No

Craig earns extra money as a lifeguard. He earns $37 for 4 hours and $64.75 for 7 hours.  What is the constant of proportionality in dollars per hour? 

• $37 / hour

• $64.75 / hour

• $9.25 / hour

• $18.50 / hour

What is the constant of proportionality? 

• 45 mph

• 90 mph

• 135 mph

• 2 mph

Which best describes the graph represented in this table?

•  proportional

• non-proportional

Find the constant proportionality of 624 calories in 3 servings.

• 872 calories per serving

• 208 calories per serving

• 624 calories per serving

• 621 calories per serving

What is the constant of proportionality?

• $3

• $4

• $2

• $9

The constant of proportionality in the equation y = ½x is _______. 

• x

• y

• 1/2

• 2

A proportional relationship can be written as an equation in the form ____ = _____  _____

• y = k+x

• y = k-x

• y = kx

• y = k/x