Differential equation y/(x^2+y^2)

In summary, the conversation discusses a differential equation and the request for the person asking for help to show their progress and provide more information. It also suggests a transformation to make the problem easier.
  • #1
Nikolas7
22
0
Can you advice the changes in this diff equation:

$\d{y}{x}=\dfrac{y}{x^2+y^2}$
 
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  • #2
Hi Nikolas7 and happy new year, :)

We ask that a new question is posted in a new thread rather than tagged at the end of an existing thread (http://mathhelpboards.com/rules/).
That's why I have moved your post to a new thread.

We also ask that our users show their progress (work thus far or thoughts on how to begin) when posting questions. This way our helpers can see where you are stuck or may be going astray and will be able to post the best help possible without potentially making a suggestion which you have already tried, which would waste your time and that of the helper.

Can you post what you have done so far?
 
  • #3
Nikolas7 said:
Can you advice the changes in this diff equation:

$\d{y}{x}=\dfrac{y}{x^2+y^2}$

I am wondering if this is the correct DE. Are you sure it's not $\displaystyle \begin{align*} \frac{\mathrm{d}y}{\mathrm{d}x} = \frac{y^2}{x^2 + y^2} \end{align*}$?
 
  • #4
Prove It said:
I am wondering if this is the correct DE. Are you sure it's not $\displaystyle \begin{align*} \frac{\mathrm{d}y}{\mathrm{d}x} = \frac{y^2}{x^2 + y^2} \end{align*}$?
This would be wonderful if that was true b/c the equation is homogenous. With the right side numerator of power one, the problem is a little more difficult!
 
  • #5
Make the transformation

\(\displaystyle x = - \dfrac{r s'}{s},\;\;\; y = r\)

where \(\displaystyle s = s(r)\) and see where that takes you.
 

FAQ: Differential equation y/(x^2+y^2)

What is a differential equation?

A differential equation is an equation that relates one or more unknown functions to their derivatives. It is used to model various real-world phenomena in fields such as physics, engineering, and economics.

How do you solve a differential equation?

There is no one set method for solving a differential equation, as it depends on the specific equation and its properties. However, some common techniques include separation of variables, using an integrating factor, and using substitution methods.

What does the notation y/(x^2+y^2) mean?

The notation y/(x^2+y^2) represents a differential equation in the form of dy/dx = f(x,y), where the function f(x,y) is defined as y/(x^2+y^2). This means that the rate of change of y with respect to x is equal to the function y/(x^2+y^2).

What is the significance of the denominator in the differential equation y/(x^2+y^2)?

The denominator x^2+y^2 represents the distance between the point (x,y) and the origin on a 2-dimensional coordinate plane. This makes the differential equation a type of polar differential equation, where the solution can be interpreted as a curve in polar coordinates.

Can differential equations be used to model real-world phenomena?

Yes, differential equations are widely used in various fields to model real-world phenomena such as population growth, chemical reactions, and electrical circuits. They allow for the prediction of future behavior based on current conditions and can also be used to analyze the behavior of systems over time.

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