3 equations 3 unknowns in exponents

LisaDrapeau

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How would you solve for x,y,z in the equation a^x + b^y = c^z, given that you have 3 equations and all values for a,b,c? Augmented matrix taking the logs of all 3 equations? Something like xlog(a)+ylog(b)-zlog(c)=0 for setting up the matrix?

I apologize if this is in the wrong thread. I am new and wasn't sure where it should go.
 
How would you solve for x,y,z in the equation a^x + b^y = c^z, given that you have 3 equations and all values for a,b,c? Augmented matrix taking the logs of all 3 equations? Something like xlog(a)+ylog(b)-zlog(c)=0 for setting up the matrix?

I apologize if this is in the wrong thread. I am new and wasn't sure where it should go.
Please post the COMPLETE problem. There may be different interpretations for different values of the parameters.
xlog(a)+ylog(b)-zlog(c)=0
That will NOT work for most of the cases.
 
Here is my system of equations:

9.6^x + 10^y = 0.999375374^z
7.4^x + 10^y = 0.966833043^z
4.2^x + 10^y = 0.767117458^z

What I need to do is determine if constant values for x,y,z exist. And if they do, what are their values? However I am not asking to have it solved for me. I'm just asking how I go about solving a problem like this.
 
Last edited:
Please post the COMPLETE problem. There may be different interpretations for different values of the parameters.

That will NOT work for most of the cases.
Here is my system of equations:

9.6^x + 10^y = 0.999375374^z
7.4^x + 10^y = 0.966833043^z
4.2^x + 10^y = 0.767117458^z

What I need to do is determine if constant values for x,y,z exist. And if they do, what are their values? However I am not asking to have it solved for me. I'm just asking how I go about solving a problem like this.
 
Here is my system of equations:

9.6^x + 10^y = 0.999375374^z
7.4^x + 10^y = 0.966833043^z
4.2^x + 10^y = 0.767117458^z

What I need to do is determine if constant values for x,y,z exist. And if they do, what are their values? However I am not asking to have it solved for me. I'm just asking how I go about solving a problem like this.
If I this was my assignment, I would first note that 10^y is in every equation. So I will use subtraction to reduce this system to 2 unknowns.
 
I am doubtful that there is a closed form solution.

Following SK’s suggestion to eliminate 10^y, I would graph the two remaining equations and see where they intersect.
 
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