Question

Y varies jointly as x and the inverse of z. y=-12 when x=-8 and z=6. Find y when x=5 and z=-3.

Answer 1

hint:

y varies jointy as x and inverse of z means..
\[y = \frac{kx}z\]
does that help? or do you need more help?

Answer 2

What about the k do I need to put any number for it ?

Answer 3

yes. you solve for it,

let y = -12; x = -8 and z = 6

then solve for k