Direct and Inverse Variation Review

Which of the given graphs is a direct variation?

• A

• B

• C

• D

Which equations represent a direct variation?

• y=2x

• xy=2

• y=2/x

• y/x=2

Which equations represent an inverse variation?

• y=2x

• xy=2

• y=2/x

• y/x=2

Given the table, determine if it represents a direct variation, inverse variation, or neither.

• Direct Variation

• Inverse Variation

• Neither

 Y varies directly with x, and y is 84 when x is 16. Which equation represents this situation?

• y=1344x
• y=100x
• y=5.25x
• y=4/21x

 Y varies inversely with x, and y is 0.5 when x is 4. Which equation represents this situation?

• y=2x
• y=2/x
• y=4x
• y=x/2

The sales at a baseball game vary directly with the number of people attending.  If sales for a game are $12,000 when 800 people attend, determine attendance if sales are $30,000

• 1200 people
• 1500 people
• 2000 people
• 2400 people

The time it takes to fly from Los Angeles to New York varies inversely as the speed of the plane. If the trip takes 6 hours at 900 km/h, how long would it take at 800 km/h?

• 5.33 hours 
• 6.75 hours 
• 12 hours 
• 10 hours 

Determine if the following graph is a direct, inverse, or neither variation.

• Direct Variation

• Inverse Variation

• Neither

Determine if the following graph is a direct, inverse, or neither variation.

• Direct Variation

• Inverse Variation

• Neither