Inverse and Direct Variation

Which of the following represents direct variation?

• y = kx
• y = k/x
• y = x/k
• y = mx + b

Which of the following represents inverse variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

Which equation represents an inverse variation?

• y = 40/x
• y = 40x
• y/x = 40
• x = y/40

Which equation below represents a direct variation?

• y = -2x
• y = -3x -5
• y = -1
• x + 3y = 15

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

• y= 1344x

• y= 100x

• y= 21/4 x

• y= 4/21 x

Y varies inversely with x, and y is 0.5 when x is 4. Which equation represents this situation?

• y=2x

• y=2/x

• y=4x

• y=x/2

• direct variation

• inverse variation

• neither

• both

The image is an example of the graph of a(n)

• direct variation
• inverse variation
• neither
• both

Is the following graph direct, inverse, or neither?

• direct variation

• inverse variation

• neither

• both

y varies directly as x, if y=4 when x=3, find x when y=-12

• -16
• 16
• -9
• 9