Solve Linear Programming Problem Using Simplex Method

Notes on formatting:
(1) Variable names must begin with letters,
(eg. x1, x2, x3)

(2) Minimize values like,
(eg. 4x1 + 1x2)

(3) Constraints values like,
(eg. 2x1 + 4x2>=0, 2x1 + x2=0, x1 + 2x2<=0)