Direct vs Indirect Variation

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

Determine the type of variation.

• Direct

• Inverse

• None

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

• direct

• inverse

Determine the type of variation.

• Direct

• Inverse

• None

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

• inverse

• direct

• neither

Type of variation?

The time you study for a test, the grade you will get on the test.

• direct

• inverse

Type of variation?

Hours you work at your job and your paycheck amount.

• direct

• inverse

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

The amount of money earned on a job is directly proportional to the number of hours worked.  If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?

• $2

• $308

• $1.57

• $265

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

• Yes; 1/4

• Yes; 4

• Yes; 1/2

• No