Suppose that y varies jointly with w and x and inversely with z and y = 32 - when w = 6, x = 20, and z = 3. Write the equation that models the relationship

Y directly proportional to WX and inversely to Z.

Y=k (WX) / Z

Where k is the constant of proportionality.

So, the first thing is to find the value of this constant.

k = YZ/WX

= (32*3) / (6*20)

= 96/120

= 0.8

The equation that models the relationship will be;

Y = 0.8 (WX/Z)