Help with Method of Characteristics - PDE's

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The discussion focuses on solving the partial differential equation (PDE) using the method of characteristics, specifically the equation xux + yuy = 1. The initial condition provided is u(x,y) = 1 when x² + y² = 1. The user successfully derived the equations du/ds = 1, dx/ds = x, and dy/ds = y, leading to u = s + K1, x = K2e^s, and y = K3e^s. However, the user seeks guidance on how to apply the initial conditions to finalize the solution.

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1. Use the method of characteristics to solve: xux+yuy=1



2. given condition of u(x,y)=1 when x2+y2=1



3. I know I need to transpose into the s-t domain. Using: du/ds=uxdx/ds+uydy/ds=aux+buy
so a=x & b=y...

please help
 
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I was able to solve for the following:
du/ds=1 integrate to get u=s+K1
dx/ds=x integrate to get x=K2es
dy/ds=y integrate to get y=K3es

I am unsure how to use the IC's
 

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