Inverse Variation in Daily Life

x and y vary inversely. Given (5, 20), what is the constant k?

• 4

• 5

• 25

• 100

Does the equation show an inverse variation? 
y=10/x

• yes

• no

Which of the following represents indirect variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

• Direct

• Inverse

• niether

Which equation represents an inverse variation?

• y = 40/x

• y = 40x

• y/x = 40

• x = y/40

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

• direct variation

• inverse variation

• neither

• both

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

• 14

• 10

• 2

• -14

y varies inversely as x, if y = -3 when x = -6, find y when x = 14.

• 11

• -11

• 9/7

• 7/9

If y varies inversely as x, and y = 23 when x = 8, find y when x = 4.

• 26

• 46

• 52

• 92