Solving x^y=y^x & x+y=6 with Deduction

  • Context: High School 
  • Thread starter Thread starter arka.sharma
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Discussion Overview

The discussion revolves around solving the equations x^y = y^x and x + y = 6. Participants explore deductive methods, graphical solutions, and numerical approaches to find values for x and y.

Discussion Character

  • Exploratory
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant, Arka, presents the equations and suggests that known solutions include (x=4, y=2), (x=3, y=3), and (x=2, y=4), questioning if there is a deductive method to solve them.
  • Another participant proposes solving the equation (6-y)^y = y^(6-y) graphically.
  • A follow-up question seeks clarification on how to solve the equation (6-y)^y = y^(6-y).
  • One participant suggests plotting the left-hand side and right-hand side of the equation to find intersections, indicating that graphical representation could reveal known and potentially unknown roots.
  • Another response reiterates the graphical approach and mentions that numerical iteration methods could also be used, while stating that there is no elementary algebraic solution available.

Areas of Agreement / Disagreement

Participants generally agree on the graphical approach and the lack of an elementary algebraic solution, but there is no consensus on the best method to proceed or on the completeness of the solutions.

Contextual Notes

The discussion does not resolve the assumptions underlying the methods proposed, nor does it clarify the completeness of the solutions presented.

arka.sharma
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Hi All,

I was given two equations back in my school days to solve for both x and y it is as follows

x^y = y^x & x+y = 6

Now it can be seen that following would be possible solutions (x=4,y=2),(x=3,y=3),(x=2,y=4).
But is there any deductive way to solve this ?

Regards,
Arka
 
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Solving (6-y)^y == y^(6-y)
Which can be represented graphically.
 
Thanks for your reply. But how to solve the equation (6-y)^y == y^(6-y) ?
 
Put the RHS and the LHS of the equation on a graphic and see where these curve cut each other.
You will find the root that you already know.
If there are other roots, you will likely find out.
Afterward, you might find out arguments to "prove" you found all the roots.
The graphical representation will help a lot.
 
arka.sharma said:
Thanks for your reply. But how to solve the equation (6-y)^y == y^(6-y) ?
You were told to solve it graphically. It can also be solved using a numerical iteration method. If you are looking for an elementary algebraic way of solving it, there is none.
 

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