Direct vs Inverse Variation

Given that y varies inversely with x, if x =7 and y = 4, what is y when x = 2?

• 14

• 10

• 2

• -14

True or False:
Direct Variation passes through the origin of a graph and inverse variation does not.

• True

• False

Does the table show an inverse variation?

• Yes

• No

Which of the following represents direct variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

The width of a rectangle varies inversely with its length.  If the width is 6 when the length is 24, give an equation that shows the relationship.

• y = 4x

• y = 144x

• y = 4/x

• y = 144/x

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

If x and y vary directly, what is the missing value in the points (x, 4) and (-14, -8)?

• x = -7

• x = -2.3

• x = 2.3

• x = 7

The value of y varies directly with x.  Which function represents the relationship between x and y if y = 14 when x = 6. 

• y=20x

• y=84x

• y=7/3x

• y=3/7x

Which of the following represents indirect variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

What type of variation does this scenario represent?
The length of time you charge your cell phone
and the battery power 

• direct variation

• inverse variation

• joint variation

• none of these