unit 7 test bank

Which of the given graphs is a direct variation?

• A
• B
• C
• D

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

• 26
• 3
• 58.5
• 2

What ordered pair does a direct variation always go through when graphed?

• (0, 0)
• (1, 0)
• (0, 1)
• (1, 1)

 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

The number of pages that Cason can read varies directly with the time spent reading.

If he reads 12 pages in 4 minutes, how many pages can he read in 17 minutes?

• 51 pages

• 47 pages

• 60 pages

• 75 pages

• y
• x
• constant of proportionality
• origin
• x-intercept
• y-intercept
• x-axis
• y-axis

The equation 
xy =  25  represents:

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

When building a house, the number of days required to build is inversely proportional to with the number of workers. One house was built in 85 days by 5 workers. How many days would it take to build a similar house with 25 workers?

• 17

• 20

• 30

• 425

What does "k" stand for in the direct variation equation?

• constant of equality

• constant of proportionality

• constant of non-proportionality