Direct Variation

If y vaires directly with x and y= 12 when x= 15. What is the value of x when y= 16?

• 12.8

• 20

• 11.25

• 19

Which of the given graphs is a direct variation?

• A

• B

• C

• D

Write the equation for the table given.

• y = 1/3x

• y = 3x

• y = 1/2x

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

What is the constant of proportionality (in miles per hour) based on the table?

• 45

• 90

• 135

• 2

Is this a direct variation?

• yes

• no

Which graph shows a proportional relationship between x and y?

• A

• B

• C

• D

Which graph shows a proportional relationship between x and y?

• A

• B

• C

• D

Y varies directly with x, and y is 84 when x is 16. Which equation represents this situation?

• y=1344x

• y=100x

• y=5.25x

• y=4/21x

What does the Direct Variation Equation look like?

• Y= kx

• y = mx + b

• y = b

• y = x