Find conditions on a point (x0, y0, u0, v0) such that there exist real-valued functions u(x, y)

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Find conditions on a point (x0, y0, u0, v0) such that there exist real-valued functions u(x, y) and v(x, y) which are continuously differentiable near (x0, y0) and satisfy the simultaneous equations
xu2 + yv2 + xy = 9
xv2 + yu2 - xy = 7.
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