Express as a differential equation in terms of x, y and t

**Punch** · December 17th 2011, 06:31 PM

Given that two quantities x and y, both vary with time t. express the following statesments as differential equations involving x, y and t.

The rate of change of y with respect to t is inversely proportional to x.

$\frac{dy}{dt}=\frac{k}{x}$

How do I continue?

**ILikeSerena** · December 17th 2011, 08:09 PM

I believe you are done.
You expressed the statement as a DE.

You cannot solve it without more information.

**chisigma** · December 17th 2011, 10:04 PM

Originally Posted by Punch

Given that two quantities x and y, both vary with time t. express the following statesments as differential equations involving x, y and t.

The rate of change of y with respect to t is inversely proportional to x.

$\frac{dy}{dt}=\frac{k}{x}$

How do I continue?

The DE is 'separable variables' and can be written as...

$x(t)\ dy = k\ dt$ (1)

If x(t) is known, then the solution is obtained in standard way integrating both terms of (1). If it isn't You need another DE to find x(t) and y(t)...

Marry Christmas from Serbia

$\chi$ $\sigma$

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