Solve the following LP model using the simplex method.  Minimize z = −4x1 + 6x2 − 2x3 + 4x4 Subject to: x1 + 2x2 + 2x3 + 4x4 ≤ 40 2x1 − x2 + x3 + 2x4 ≤ 8 4x1 − 2x2 + x3 − x4 ≤ 10 x1, x2, x3, x4 ≥ 0

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.2: Direct Methods For Solving Linear Systems
Problem 3BEXP
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Solve the following LP model using the simplex method. 

Minimize z = −4x1 + 6x2 − 2x3 + 4x4

Subject to:

x1 + 2x2 + 2x3 + 4x4 ≤ 40
2x1 − x2 + x3 + 2x4 ≤ 8
4x1 − 2x2 + x3 − x4 ≤ 10
x1, x2, x3, x4 ≥ 0

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