Chapter 7 Review

What does the Direct Variation Equation look like?

• y= kx
• y = mx + b
• y = b
• y = x

What kind of equation is this?
xy=8

• Linear Equation
• Direct Variation
• Inverse Variation
• Joint Variation

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

• x
• y
• 400
• Not enough information given

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

What kind of equation is this?
xy=8

• Linear Equation
• Direct Variation
• Inverse Variation
• Joint Variation

Tell whether x and y show direct variation, inverse variation, or neither.

• direct variation

• inverse variation

• neither

Tell whether x and y show direct variation, inverse variation, or neither.

• direct variation

• inverse variation

• neither

The variables x and y vary inversely, and y = 8 when x = 4.

Write an equation that relates x and y.

• y = 32 x

• y = ³² / _x

• y = 2 x

• y = ² / _x

Which equation represents inverse variation?

• y = x + ⅕

• y = (⅕) x + 5

• y = (⅕) x

• y = ⁵ / _x

• y = 5 x