Solve the following problem using x3 and x4 as starting basic feasible variables. As in problem 6, do not use any artificial variables.
Minimize z = 3x1 + 2x2 + 3x3
Subject to
X1 + 4x2 + x3 ≥ 7
2x1 + x2 + x4 ≥ 10
X1, x2, x3, x4 ≥ 0