Gaokao Math Practice Question
设 $x, y$ 满足约束条件 $\left\{\begin{array}{l}2 x+3 y-3 \leqslant 0 \\ 2 x-3 y+3 \geqslant 0 \\ y+3 \geqslant 0\end{array}, \quad\right.$ 则 $z=2 x+y$ 的最小值是 ($\qquad$)
- A.-15
- B.-9
- C.1
- D.9
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