# Suppose that y varies jointly with w and x and inversely with z and y=400 when w=10, x=25 and z=5. How do you write the equation that models the relationship?

##### 1 Answer

Apr 5, 2016

#### Answer:

#### Explanation:

As

Combining (A) and B), we have

As when

Putting these in (C), we get

Hence #k=400/5=80 and our model equation is