Algebra I 2016 SOL A.8 - Direct & inverse variations

A person’s weekly pay is directly proportional to the number of hours worked. Shawn’s pay is $123.00 for 20 hours of work. What is the constant of variation?

• k = 123
• k = 20
• k = 6.15
• k = 0.16

In a direct variation, y = 39 when x = 3. 
Find the value of y when x = 2.

• 26
• 3
• 58.5
• 2

What type of variation does this scenario represent?
You and some friends decide to buy 2 pizzas and split the cost evenly.
The number of friends who are sharing the cost of the pizzas
and the amount of money you pay for your share.

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

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

Which of the following represents direct variation?

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

Which of the following represents inverse variation?

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

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

• 14
• 10
• 2
• -14

In this type of variation, both x and y are either increasing or both are decreasing

• indirect

• direct

• neither

In this type of variation, x and y are doing the opposite- when one is increasing, the other is decreasing

• inverse

• direct

• neither

State what type of variation the equation represents.

• Direct

• Inverse

• Joint

• None