I need help understanding how to solve this problem. Like, I don't want it to be done for me, but I just don't understand how to do it.
If z=30 when x=3 and y=2, write the function that models the relationship.
z varies directly with x and inversely with y.
Please help me? (:

Question

I need help understanding how to solve this problem. Like, I don't want it to be done for me, but I just don't understand how to do it.
If z=30 when x=3 and y=2, write the function that models the relationship.
z varies directly with x and inversely with y.
Please help me? (:

amistre64 · Answer

if z varies directly with x; then z = kx
if z varies indirectly with y; then z = m/y

if we address them as one; then z = (km)x/y

amistre64 · Answer

we know zx and y we can solve for (km)

anonymous · Answer

So... I just plug in the numbers in to z = (km)x/y?

amistre64 · Answer

yep; the solution is to have a constant value for (km); which is determined by the specific values they give you.

anonymous · Answer

Okay. (: Thanks. I kinda get it now.

amistre64 · Answer

good luck :)