All Solutions to Equation with Integer Variables

  • Context: Undergrad 
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Discussion Overview

The discussion revolves around finding all integer solutions to the equation \(\frac{1}{x} + \frac{2}{y} - \frac{3}{z} = 1\). Participants explore methods for identifying solutions, including specific substitutions and algebraic manipulations.

Discussion Character

  • Exploratory, Technical explanation, Mathematical reasoning

Main Points Raised

  • One participant suggests that setting \(y = 2\) leads to an infinite number of solutions, prompting a search for a systematic method to list all integer solutions.
  • Another participant provides a rearrangement of the equation, indicating that since \(x\) divides the right-hand side, it must also divide \(yz\), which may assist in finding solutions.
  • A different participant notes that with three unknowns, the number of solutions is infinite in the real numbers, and proposes a specific expression for \(x\) in terms of \(y\) and \(z\).
  • One participant asks if there is a way to verify the proposed solutions.
  • Another participant agrees with the idea of assuming a fixed value for one variable to demonstrate the existence of infinite solutions for the others.

Areas of Agreement / Disagreement

Participants generally agree that there are infinitely many solutions, particularly in the context of real numbers, but the discussion remains open regarding the systematic identification of all integer solutions.

Contextual Notes

The discussion does not resolve the specific methods for systematically finding all integer solutions, and assumptions about the variables' ranges are not fully explored.

recon
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I've been asked to find all integer solutions to the following equation.

[tex]\frac{1}{x} + \frac{2}{y} - \frac{3}{z} = 1[/tex]

Suppose I set y = 2, then it seems to me that there is an infinite number of solutions to the equation.

Is there a systemic way for me to list ALL the integer solutions?
 
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yz+2xz-3xy=xyz

Rearrangements such as

yz=xyz-2xz+3xy

tell you that since x divides the rhs it divides yz, and so on, that may help with any systematic search
 
Since u have an equation with 3 unknowns,obviously the # of triplets/sollution is infinite in R.In N,things would go like that

[tex]x=\frac{yz}{yz-2z+3y}\in \mathbb{N}[/tex]

Daniel.
 
Is there a way for you to check the answer?
 
I think you provided a pretty good argument. If you're trying to show that the solutions are infinite, assume one of the variables takes on on value (like you did with y=2), and say that there are an infinite number of x's and z's that solve the remaining equation.
 

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