Review Direct, Inverse and Joint Variation

w = 10⋅x⋅y⋅z represents:

What type of variation does this scenario represent?

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

x and y are in inverse variation

x=6 and y=7

Given y=k/x... Find k

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

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

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

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

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

Which of the following represents direct variation? (a)