Simplex method in prime how to use the constrains maximise s.t. constraints.

[HPCarnace]

I have not read the book, but, I had made a program called 'TORA' to solve these linear programming problems, including the graphical method. My program is based on the "Advanced Graphics" application so after exiting the program the equations appear in the Symbolic View and as dg1969 suggests it is better with "AND" (the feasible region is shown more clearly)

I don't know if the book "HP prime guide finite mathematics" explains this: https://www.phpsimplex.com/en/graphical_...illustrate %20more%20than%203D.
What you are asking is step 5 and 6