Direct and Indirect Variations

State what type of variation the equation represents. (a)  

• Direct

• Inverse

• Joint

• None

If the both quantities are increasing or decreasing then its called as

• Direct Variation

• Inverse Variation

If y varies inversely as x, and y = 32 when x = 3, find x when y = 15.

• 3/5

• 8/5

• 16/5

• 32/5

If x varies inversely as the square root of y, and x = 9 when y = 121, find x when y = 81. (a)  

• 7

• 11

• 13

• 17

In this type of variation, both x and y are either increasing or both are decreasing (a)  

• indirect

• direct

• neither

In this type of variation, x and y are doing the opposite- when one is increasing, the other is decreasing (a)  

• inverse

• direct

• neither

Which of the following represents direct variation? (a)  

• y = kx

• y = k/x

• y = x/k

• y = mx + b

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

• y=1344x

• y=100x

• y=5.25x

• y=4/21x

Does the equation show an inverse variation? 
y=10/x

• yes

• no

What is the equation that fits this data for either a direct or Inverse Variation?

• Direct Variation

  k=2x

  y=2

• Indirect Variation

  k=2

  y=2x

• Direct Variation

  k=2x

  y=2

• Direct Variation

  k=2

  y=2x