Is my answer correct?
Assume that y varies inversely as x. If y=-8 when x=-9, find y when x=4.
A. y=18
B. y=72
C. y=4.5

Question

Is my answer correct?
Assume that y varies inversely as x. If y=-8 when x=-9, find y when x=4.
A. y=18
B. y=72
C. y=4.5 <---

nnesha · Answer

what is the equation for inverse variation :-) ??

anonymous · Answer

Umm.. I'm not sure... Sorry..  I haven't learned that..

nnesha · Answer

ohh so how did you get the answer ?? :o

nnesha · Answer

okay equation for inverse variation is  $$\huge\rm y = \frac{ k }{ x }$$
now replace variables y and x by their values and solve for k

anonymous · Answer

I guessed. I was absent when we went over the inverse variation. I will try that, thank you.

anonymous · Answer

Wait, where did k come from? o.o

nnesha · Answer

heheh k is a ghost that's an equation for direct variation 
so first of all you should find k to find y

nnesha · Answer

|dw:1431315825183:dw|
when it says "inverse variation" you should use this equation 
now replace y and x by their values and solve for k let me know what you get :-)