Direct Variation Practice Quiz

Eduardo counted ten seconds between seeing lightning and hearing thunder, and he knew that the lightning was about 2 miles away. What is the constant of variation?

• k = 10
• k = 2
• k = 5
• k = 1/5

Tags

CCSS.HSF-LE.A.1B

Eduardo counted ten seconds between seeing lightning and hearing thunder, and he knew that the lightning was about 2 miles away. What is the equation of variation?

• y = 10x
• y = 2x
• y = 5x
• y = 1/5x

Tags

CCSS.HSF-LE.A.1B

A dishwasher uses 65 gallons of water to wash 5 loads of dishes. What is the constant of variation?

• k = 13
• k = 65
• k = 5
• k = 1/13

Tags

CCSS.HSF-LE.A.1B

A dishwasher uses 65 gallons of water to wash 5 loads of dishes. What is the equation of variation?

• y = 13x
• y = 65x
• y = 5x
• y = 1/13x

A dishwasher uses 65 gallons of water to wash 5 loads of dishes. How many gallons of water would be used to wash 12 loads? 

• 60 gallons
• 780 gallons
• 156 gallons
• 12/13 gallons

Tags

CCSS.HSF-LE.A.1B

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

• 300
• 75
• 1,875
• 12

The number of kilograms of water in a person’s body varies directly as the person’s mass.  A person with a mass of 90 kg contains 60 kg of water.  How many kilograms of water are in a person whose mass is 75 kg?

• 50 kg water
• 72 kg water
• 94 kg water
• 150 kg water

If y varies directly with x, and y = 6 when x = 2, what is the value of y when x = 4?

• 4

• 3

• 12

• 2

Which of the following equations represents direct variation? Select 2 correct answers.

• y = x^2

• y = 2x

• y = 3x

• y = 5 + x

If y varies directly with x, and y = 12 when x = 3, what is the value of y when x = 6?

• 6

• 18

• 36

• 24