Folium of descartes curve

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Homework Statement


the curve x^3+y^3=3xy is called the folium of descartes.

Show that x+y=3/((x/Y)-1+(y/x)), and hence that x+y = -1 is an oblique asymptote.


Homework Equations





The Attempt at a Solution


I have done the first part of the question, though i am just having trouble showing that it is an oblique asymptote. I am trying to get just x on the denominator so that as x approaches infinity, the fraction will approach 0 and rearrange from there. No luck so far.
 
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