作业帮设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3
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设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3
设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3<=0,求目标函数z=2x+y的最大值
设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3
画图,在（3,0）点处取最大值,代入z=2x+y得6
可以用lingo求解，代码如下：
max=2*x+y;
y>=0;
x-y+1>=0;
x+y-3<=0;
结果为：
Global optimal solution found.
Objective value: 6.000000
Infeasibilities: ...
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可以用lingo求解，代码如下：
max=2*x+y;
y>=0;
x-y+1>=0;
x+y-3<=0;
结果为：
Global optimal solution found.
Objective value: 6.000000
Infeasibilities: 0.000000
Total solver iterations: 1
Variable Value Reduced Cost
X 3.000000 0.000000
Y 0.000000 1.000000
Row Slack or Surplus Dual Price
1 6.000000 1.000000
2 0.000000 0.000000
3 4.000000 0.000000
4 0.000000 2.000000
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