Direct & Inverse Variation

What does the Direct Variation Equation look like?

• y= kx

• y = mx + b

• y = b

• y = x

Is the given table a direct variation? If so, what is the constant of variation?

• Yes; 1/3

• Yes; 3

• Yes; 5

• No

Which of the given graphs is a direct variation?

• A

• B

• C

• D

Is the given table a direct variation? If so, what is the constant?

• Yes; 1/4

• Yes; 4

• Yes; 2

• No

True or False:
An inverse variation is always a curve and a direct variation is always a line?

• True

• False

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

• x

• y

• 400

• Not enough information given

• direct variation
• inverse variation
• neither direct nor inverse variation

• direct variation
• inverse variation
• neither direct nor inverse variation

The equation 
xy =  25  represents:

• direct variation

• inverse variation

• joint variation

• none of these

Which of the following is NOT a direct variation?

• y = -2x

• y = 1/2x

• 2x + 3y = 2

• 3y = 4x