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Graphically minimize and maximize z = 3x...

Graphically minimize and maximize `z = 3x + 4y` subject to the constraints: `x + y le 40 x + 2y le 80, x - 2y ge - 20 x, y ge 0`.

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The correct Answer is:
manimum value = 120 at (40,0) and maximum value = 240 at (80,0)
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