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Question: Can you please tell me how to fix this mistake?

Question: Can you please tell me how to fix this mistake?

denkasyan 20 Maple 2017
polyhedralsets
March 27 2018
2

Hello. Tell me please how to fix it and build a graph? Thank you in advance.

p := PolyhedralSets([-x >= 0, -y >= 0, -z >= 0, -(1/2)*x >= 0, (-x-y)*(1/2) >= 0, (-x-z)*(1/2) >= 0], {y = -20}, [x, y, z]);
plot(p);
Error, (in plot) cannot determine plotting variable
 
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