The rule below shows how mrs. rousseau's long-distance phone company computes her monthly bill. which answer expresses that rule in the form of an equation?

Im not sure what your asking, but heres an equation for what u think it is..

y(<---represents her bills) divide u (<--- represents how much months or the timelines of what your doing) 

thats really it if your asking what I think you are ( You werent very specific)