title: Awkward Substitution in Sympy
body: <p>Is there a simpler way to do substitution in Sympy which is similar to Sage or Mathematica. 
  In Mathematica You have something called as eliminate() which given a set of equations you can ask it to eliminate certain variables.
  In Sage you need to be more hands on with it but its still more or less similar to Mathematica. 
  In Sympy comparatively its more awkward to do substitution.</p>
  
  <p>In the screenshot the red arrows show what i am talking about. The white Arrow is the method i think would be more appropriate. </p>
  
  <p><img src="https://i.stack.imgur.com/FQHzd.jpg" alt="http://i.stack.imgur.com/FQHzd.jpg"></p>
  
  <p>edit 1: here is a link to the function in mathematica <a href="http://reference.wolfram.com/mathematica/ref/Eliminate.html" rel="nofollow noreferrer">http://reference.wolfram.com/mathematica/ref/Eliminate.html</a></p>