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Show by graphical method that the feasib...

Show by graphical method that the feasible region of the following LPP is unbounded but it has unique optimal solution x=3 ,y =18
Minimize Z=4x+2y
subject to the constraints
`3x+y ge 27`
`-x-y le -21`
`x+2y ge30`
and `xge 0,y ge 0`

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