I have the following PDE
$$\left(x^2 + 1 \right) u_x - x y \, u_y = 0$$
I tried to solve it, but I know I'm getting the wrong answer. The following is a photo of my solution. Can someone help me, please?
2026-03-26 12:58:29.1774529909
Solving 1st order PDE via the method of characteristics
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