Is this first order differential equation

by Prof. MaMad   Last Updated November 09, 2018 00:20 AM

$dx/dz= (x+y)/(x+y+2z)$

I think y should be constant here. This equation is part of solving below PDE with Method of characteristics path.

$(x+y)Z_x+(x+y)Z_y+(x+y+2Z)=0$



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