Direct and Inverse Variation

What is the constant of variation and the slope?

• -3

• 0

• 3

• 2

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

For direct variation, you ______.

• Add

• Subtract

• Multiply

• Divide

The sales at a baseball game vary directly with the number of people attending.  If sales for a game are $12,000 when 800 people attend, determine attendance if sales are $30,000

• 1200 people

• 1500 people

• 2000 people

• 2400 people

The width of a rectangle varies inversely with its length. if the width is 4 when the length is 18, find the width when the length is 8.

• 9

• 72

• 36

• 2

y varies directly as x, if y=12 when x=5, find y when x=3

• 36/5

• 15/12

• 12/5

• 12/15

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

• -16

• 16

• -9

• 9

Points (3,10) and (x, 15) represent a direct variation. Find x.

• 50

• 5

• 3.5

• 4.5

y varies inversely as x, if y = -3 when x = -6, find y when x = 14.

• 11

• -11

• 9/7

• 7/9