Can one find an integral representation of the solution of the following system of PDEs?

pde1 := diff(f(x,y),x) + A(x) * ( p11* f(x,y) + p12 + p13*x )

= p14 * B(y)/B(x) * diff(f(x,y),x);

pde2 := diff(f(x,y),y) + A(y) * ( p21* f(x,y) + p22 + p23*y )

= p24 * B(x)/B(y) * diff(f(x,y),y);

f(x,y) is the unknown function,

A(x) and B(x) are known functions,

p11, p12, etc. are real parameters.

If p14=0 and p24=0, the right-hand...