Direct and Inverse Variation

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

• Yes; 1/4

• Yes; 4

• Yes; 2

• No

The sales at a baseball game vary directly with the number of people attending.  If sales for a game are $12,000 when 800 people attend, determine attendance if sales are $30,000

• 1200 people

• 1500 people

• 2000 people

• 2400 people

The table represents

• direct variation

• inverse variation

• neither

• both

Which of the following is NOT a direct variation?

• y = -2x

• y = 1/2x

• 2x + 3y = 2

• 3y = 4x

Which statement about this relation is true?

y varies directly with x. When y = 39,  x = 3.  Find the value of y when x = 2.

• 26

• 3

• 58.5

• 2

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

• 300

• 75

• 1,875

• 12

The time to complete a project varies inversely with the number of employees.
If 3 people can complete the project in 7 days, how long will it take 5 people?

• 12 days

• 4.2 days

• 6.2 days

• 10 days

Which of the given graphs is a direct variation?

• A

• B

• C

• D

What type of variation?

• Direct

• Inverse

• Neither