Direct and Inverse Variation

• direct variation
• inverse variation
• neither direct nor inverse variation

The equation 
xy =  25  represents:

• direct variation
• inverse variation
• joint variation
• none of these

• direct variation
• inverse variation
• joint variation
• none of these

• direct variation
• inverse variation
• joint variation
• none of these

• direct variation
• inverse variation
• joint variation
• none of these

Suppose y varies directly as x.
If  y = 22.5 when x = 15, find y when x = 20.

• 1.5
• 337.5
• 30
• 16.875

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

• 300
• 75
• 1,875
• 12

Which of the following represents direct variation?

• y = kx
• y = k/x
• y = x/k
• y = mx + b

Which of the following represents indirect variation?

• y = kx
• y = k/x
• y = x/k
• y = mx + b

 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