Help Me Solve Equationsystem Problem with x & y

  • Context: High School 
  • Thread starter Thread starter nastyjoe
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Discussion Overview

The discussion revolves around a system of equations involving two variables, x and y, defined in terms of constants a, b, c, d, e, and f. Participants explore methods to simplify and solve these equations, which represent geometric shapes in the xy-plane, specifically the upper hemispheres of circles. The scope includes mathematical reasoning and problem-solving techniques.

Discussion Character

  • Mathematical reasoning
  • Exploratory
  • Homework-related

Main Points Raised

  • One participant expresses difficulty in simplifying the equations to find formulas for x and y, questioning the feasibility of the system.
  • Another participant suggests that the equations can be interpreted geometrically as the upper hemispheres of circles, depending on the values of the constants.
  • A participant mentions attempting substitution of y into the second equation but finds the resulting equation too complicated to solve.
  • Another participant provides a method to square the first equation to derive a circular equation and encourages visualizing the graph to understand the shape of the curve.
  • There is a suggestion that solving the equations may be easier through geometric interpretation rather than algebraic manipulation.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a specific method for solving the equations, and multiple approaches are discussed without resolution. The feasibility of the system remains uncertain, as does the effectiveness of the proposed methods.

Contextual Notes

Participants note the complexity of the equations and the potential dependency on the values of the constants, which may affect the intersection of the curves represented by the equations.

Who May Find This Useful

This discussion may be useful for individuals interested in solving systems of equations, particularly in the context of geometry and mathematical reasoning.

nastyjoe
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My maths skills are so rusty that I can't figure out how I simplify these equations so that I get a formula for x and y... a,b,c,d,e,f are constants

y=[itex]\sqrt{b^{2} - (x-f)^{2}}[/itex] + e
x=[itex]\sqrt{a^{2} - (y-c)^{2}}[/itex] + d

Can anyone help me? And is this equationsystem even possible?
 
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If you subtract the constants from both sides and square both sides, you should be able to see that your equations can be graphed in the xy-plane as the upper hemisphere of a circle of radius b centered at (f, e) and the upper hemisphere of a circle of radius a centered at (d, c). Whether these two curve segments intersect or not is up to the values of the constants.
To start, you can just use substitution: substitute your expression for y as a function of x into the second equation.
 
I tried substituting y as a function of x into the second equation but I got an awfully complicated equation which I was unable to solve as I'm not that good at maths... :( Are you able to get a solution?
 
nastyjoe said:
My maths skills are so rusty that I can't figure out how I simplify these equations so that I get a formula for x and y... a,b,c,d,e,f are constants

y=[itex]\sqrt{b^{2} - (x-f)^{2}}[/itex] + e
x=[itex]\sqrt{a^{2} - (y-c)^{2}}[/itex] + d

Can anyone help me? And is this equationsystem even possible?

nastyjoe said:
I tried substituting y as a function of x into the second equation but I got an awfully complicated equation which I was unable to solve as I'm not that good at maths... :( Are you able to get a solution?

Welcome to the PF.

What are these equations from?
 
If you square the first equation, you get
##(y-e)^2 + (x-f)^2 = b^2##

If you draw a graph of that equation, what shape of curve do you get? (If you can't see the answer to that, start with the simpler case when e = f = 0).

The easiest way to solve the two equations is using geometry, not algebra.
 

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