Solving Implicit Equations for y in Terms of x

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Discussion Overview

The discussion revolves around methods for solving implicit equations for y in terms of x, specifically focusing on equations like y² + yx = 1 and y³ + yx = 1. The context includes exploration of techniques relevant to AP Calculus AB, with participants seeking clarification on the steps involved in solving such equations.

Discussion Character

  • Exploratory, Homework-related, Mathematical reasoning

Main Points Raised

  • One participant inquires about the process of solving implicit equations for y in terms of x, providing specific examples.
  • Another participant suggests that finding a solution involves manipulating the function using standard arithmetic rules, implying that complex solutions are unlikely in the context of AP Calculus.
  • Several participants request step-by-step guidance on solving the provided equations, indicating a lack of clarity on the process.
  • There is mention of using the quadratic formula or completing the square for the first equation, and the cubic formula for the second, although the specifics of these methods are not detailed.

Areas of Agreement / Disagreement

Participants express a general curiosity about solving implicit equations, but there is no consensus on the specific methods or steps to take, as some seek detailed guidance while others suggest a more straightforward approach.

Contextual Notes

The discussion does not resolve the complexities involved in solving the equations, and assumptions about the participants' familiarity with mathematical techniques are not fully explored.

Who May Find This Useful

Students preparing for AP Calculus AB, individuals interested in implicit function theory, and those seeking clarification on mathematical problem-solving techniques.

Fuz
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How do you go about solving implicit equations for y in terms of x that look like these?

y2 + yx = 1

and

y3 + yx = 1

or even more complicated implicit equations.

I'm taking AP Calculus AB this year and am just curious how this is done.

Here are the solutions from Wolframalpha:
http://www.wolframalpha.com/input/?i=y^2+%2B+yx+%3D+1
http://www.wolframalpha.com/input/?i=y^3+%2B+xy+%3D+1
 
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You just need to play with the function until you find an answer. Use the usual rules of arithmetic. You aren't going to encounter any situations in AP Calculus where you would need to solve a hugely complex implicit function for y.
 
Can you show me the steps for one of them? I've already tried solving them myself, but got nowhere.
 
Fuz said:
Can you show me the steps for one of them? I've already tried solving them myself, but got nowhere.

By solve I assume you mean to express the implicit function in the form y=f(x). Well, for the first you can use the quadratic formula or complete the square (it's basically equivalent) and for the second you'll need to use the cubic formula.
 

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