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**1. Use the method of characteristics to solve: xu**

_{x}+yu_{y}=1**2. given condition of u(x,y)=1 when x**

^{2}+y^{2}=1**3. I know I need to transpose into the s-t domain. Using: du/ds=u**

_{x}dx/ds+u_{y}dy/ds=au_{x}+bu_{y}so a=x & b=y...

please help