Inverse Variations

What type of table is this?

• Inverse Variation
• Direct Variation
• Neither

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

• x
• y
• 400
• Not enough information given

Determine the type of variation:

• Direct
• Inverse
• Neither

Which of the following represents inverse variation?

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

If y varies inversely as x and x=5 when y=20, then what is the constant of variation, k? 

• 1/4
• 4
• 100
• 6

The time it take to make a trip varies inversely with the speed of the bus. When Darcy's school bus travels at 30 miles per hour, it gets from her home to school in 12 minutes. What is the speed of Darcy's bus if it makes the same trip in 18 minutes?  

• 45 mph
• 36 mph
• 28 mph
• 20 mph

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

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

Assume y varies inversely with x, if y = 15 when x = 32 find y when x = 12.

• 40
• -40
• 5
• -5

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

• 4
• 14 
• 7
• 28