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Maximise and Minimise z = 3x + 2y - 3...

Maximise and Minimise
`z = 3x + 2y - 3` subject to the constraints:
`x + y ge 4, x +y le 12, , x le 9 , y le 9 , x,y ge 0`

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The correct Answer is:
maximum value = 30 at (9,3) and minimum value = 5 at (0,4)
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