- #1
gtfitzpatrick
- 379
- 0
Homework Statement
[itex] x \frac{ \partial u}{ \partial x} + y \frac{ \partial u}{ \partial y}= -x^2u^2[/itex]
Homework Equations
The Attempt at a Solution
characteristics are given by
[itex] \frac{ dy}{ dx} = \frac{ y}{ x} [/itex] (a)
and
[itex] \frac{ du}{ dx} = -\frac{x^2u^2 }{ x} [/itex] (b)
So i integrate both equations
but for (a) do i bring the y across which ends up giving ln(y) = ln(x) + k
or leave it where it is and i get y = -yln(x) + k
??