Review Direct, Inverse and Joint Variation

w = 10⋅x⋅y⋅z represents:

• direct variation

• inverse variation

• joint variation

• none of these

What type of variation does this scenario represent?

• direct variation

• inverse variation

• joint variation

• none of these

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

• Direct

• Inverse

• Joint

• None

x and y are in inverse variation

x=6 and y=7

Given y=k/x... Find k

Mathematical Equivalence

ON

Given that y varies inversely with x, if x =7 and y = 4, what is y when x = 2?

• 14

• 10

• 2

• -14

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

• yes

• no

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

• Direct Variation

• Inverse Variation

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