Review Direct, Inverse and Joint Variation

Is the given table a direct or inverse variation? What is the constant of variation?

• Direct, 12

• Inverse, 12

• Direct, 1/12

• Inverse, 1/12

The cost per person to rent a mountain cabin is inversely proportional (varies inversely) to the number of people who share the rent. If the cost is $36 per person when 5 people share, what is the cost per person when 8 people share?

• $22.50

• $57.60

• $1.11

• $12.50

The number of units sold, s, of a product varies inversely as the price, p, of the product. If 2,340 units of a product were sold at a selling price of 44 dollars, how many units of the product would be sold if the price was 12 dollars? 

• 10,920

• 8,580

• 528

• 195

The image is an example of the graph of a(n)

• direct variation

• inverse variation

• neither

• both

Tags

CCSS.8.EE.B.5

Given (32, 15) and (12, y). Find the constant k of inverse variation, and then find the missing y value.

• 40

• 48

• -40

• -48

Tags

CCSS.HSF-LE.A.1B

Assume y varies inversely with x. If x=7 when y=4, what is y when x=2 ?

• 4

• 14 

• 7

• 28

What is the constant (k) in this inverse variation?
y = 400/x

• x

• y

• 400

• Not enough information given

Tags

CCSS.HSF-LE.A.1B

What does the Direct Variation Equation look like?

• y= kx

• y = mx + b

• y = b

• y = x

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

• 26

• 3

• 58.5

• 2