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

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

x and y are in inverse variation

x=6 and y=7

Given y=k/x... Find k

Mathematical Equivalence

ON

Does the equation show an inverse variation? 
y=10/x

• yes
• no