Inverse Variation

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

• 4
• 5
• 25
• 100

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

• yes
• no

Given the following equation, identify the constant k.
y = 54/x

• There is one.
• k = x
• 54
• y = k

Tags

CCSS.HSF-LE.A.1B

Which of the following represents indirect variation?

• y = kx
• y = k/x
• y = x/k
• y = mx + b

Which equation represents an inverse variation?

• y = 40/x
• y = 40x
• y/x = 40
• x = y/40

Which of the following represents direct variation?

• y = kx
• y = k/x
• y = x/k
• y = mx + b

If y varies inversely as x and x=11 when y=11, then what is the constant of variation, k? 

• 121
• 4
• 100
• 6

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

• 4
• 14 
• 7
• 28

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

• 300
• 75
• 1,875
• 12