System of 2 equations x^y = y^x

System of 2 equations x^y = y^x

Postby Math Tutor » Tue Aug 09, 2011 5:01 pm


System of 2 equations:
[tex]\begin{tabular}{|l}x^{y} = y^{x}\\x^{3} = y^{2} \end{tabular}[/tex]
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Re: System of 2 equations x^y = y^x

Postby Guest » Wed Sep 14, 2011 5:34 pm

The system seems to be easy but noone can solve it!
Me too :oops:
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Re: System of 2 equations x^y = y^x

Postby shemet » Sat Sep 17, 2011 6:26 am

[tex]log_{x} x^{y}=log_{x} y^{x}[/tex](x>0 from the second equation) [tex]\Leftrightarrow y=x.log_{x}y[/tex] (1)
Similarly from the second equation [tex]log_{x}x^{3}=log_{x}y^{2} \Leftrightarrow log_{x}y=\frac{3}{2}[/tex] (2).
From (1) and (2) [tex]y=\frac{3x}{ 2}[/tex]. Then again from the second equation of the system we have [tex]x^{3}=\frac{9}{4 }x^{2}[/tex] and it is easy then...

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Re: System of 2 equations x^y = y^x

Postby Guest » Sat Sep 17, 2011 11:00 am

Thank you shemet for the solution
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