Direct, Inverse, Joint Variation

State what type of variation the equation represents.

• Direct

• Inverse

• Joint

• None

What does the Direct Variation Equation look like?

• y= kx

• y = mx + b

• y = b

• y = x

Which of the given graphs is a direct variation?

• A

• B

• C

• D

Determine the type of variation:

• Direct

• Inverse

• Neither

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

• x

• y

• 400

• Not enough information given

Which of the following is NOT a direct variation?

• y = -2x

• y = 1/2x

• 2x + 3y = 2

• 3y = 4x

The value of y varies directly with x.  Which function represents the relationship between x and y if y = 14 when x = 6. 

• y=20x

• y=84x

• y=7/3x

• y=3/7x

If y varies jointly with the product of x and z, when x = 4 and z = 8, y is 96. Find y when x = 8 and z = 6.

• 36

• 87

• 96

• 144

When dealing with direct and inverse variation, the K represents what?

• Kangaroo

• K-Mart's Blue Light Special

• Constant

• King Cobra Snake

The value of y varies directly with x. Which function represents the relationship between x and y if y = 14 when x = 6. (Hint: find k)

• y=20x

• y=84x

• y=7/3x

• y=3/7x