Question: Identify the direction of decrease in z in each of the following cases: * (a) Minimize z = 4x1 - 2x2. (b) Minimize z =

Identify the direction of decrease in z in each of the following cases:

*

(a) Minimize z = 4x1 - 2x2.

(b) Minimize z = -6x1 + 2x2.

(c) Minimize z = -3x1 - 6x2.

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