# How do you write a general formula to describe each variation if z varies directly with the sum of the cube of x and the square of y; z=1 when x=2 and y=3?

##### 1 Answer

Oct 8, 2016

#### Answer:

General formula is

#### Explanation:

When a variable say

we have

Here **the sum of the cube of #x# and the square of #y#**

Hence **......................(1)**

When **(1)** becomes

or

or

Hence, general formula is