Direct and Inverse Variation Graphs

Which of the following represents direct variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

Is this proportional?

• yes

• no

Which of the given graphs is a direct variation?

• A

• B

• C

• D

What ordered pair does a direct variation always go through when graphed?

• (0, 0)

• (1, 0)

• (0, 1)

• (1, 1)

What would the equation be for this graph?

• y=x

• y=1/x

Determine the type of variation:

• Direct

• Inverse

• Neither

Which of the following represents inverse variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

If y varies inversely as x and x=5 when y=20, then what is the constant of variation, k? 

• 121

• 4

• 100

• 6

Assume y varies inversely with x. If x=7 when y=4, what is y when x=2 ?

• 4

• 14 

• 7

• 28

Write an equation for this relationship.

• y=4x

• y=1/8x

• y=1/4x

• y=8x