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Graphically minimise and maximise z = 7x...

Graphically minimise and maximise `z = 7x + 8y` subject to the constraints
`x+yge 50 `
` x+2y le 100`
` x-y ge 10`
`x,y ge 0`

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The correct Answer is:
manimum value = 350 at (50,0) and maximum value = 700 at (100,0)
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