Need help I am stuck between 2 answers.
When x=2 and y=3, z=42. Write the function that models each of the following relationships.

z varies inversely with x and directly with y.
a. z=7xy

Question

Need help I am stuck between 2 answers. 
When x=2 and y=3, z=42. Write the function that models each of the following relationships.

z varies inversely with x and directly with y.
 a. z=7xy   <<<i think it is this
 b. z=xy
 c. 42=7xy<<<< or this one
 d. x=7zy

ivettef365 · Answer

The first sounds like the correct answer

anonymous · Answer

I am thinking it is more a. because c. doesn't have z in the equation.

ivettef365 · Answer

Because it is written as a relation of z,x,y

anonymous · Answer

thank you for clearing that up for me