Direct and Inverse Graphs

Which of the following represents direct variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

Is the given table a direct variation? If so, what is the constant?

• Yes; 1/4

• Yes; 4

• Yes; 2

• No

Which of the following represents indirect variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

Suppose y varies inversely with x.
If y = 150 when x = 2, find y when x = 25.

• 300

• 75

• 1,875

• 12

Is this a direct variation?
y=2x

• yes

• no

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

• 14

• 10

• 2

• -14

Determine the type of variation:

• Direct

• Inverse

• Neither

The equation 
xy =  25  represents:

• direct variation

• inverse variation

• joint variation

• none of these

Is the given table a direct variation? If so, what is the constant?

• Yes; 1/4

• Yes; 4

• Yes; 2

• No

Which of the given graphs is a direct variation?

• A

• B

• C

• D