If we knew the values of 'x' and 'y', and the boundaries of the feasible region,
we could answer that question quickly and easily.
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Since there is no feasible region defined, there is no answer possible.
It would depend on the feasible region.
Since x and y can get smaller and smaller without a limit, there is no minimum for the value of 3x+3y.
The vertex has a minimum value of (-4, -11)
(1/x) + (1/y) + (1/z) is a minimum value when x=y=z=10. Symmetry gives either maximum or minimum value.