Question: : Without drawing any lines outside the 7 x 7 square, draw the boundaries of
the five constraints and indicate the feasible region. Draw a trial isovalue
line, the optimal isovalue line, and show the location on the graph of the
optimal solution. Use algebra to find the optimal solution (including the
OFV) exactly.

max 7x1 + 3x2
subject to
(i) 3x1 + 2x2 >= 12
(ii) x1 + 7x2 >= 21
(iii) −2x1 + 5x2 >=0
(iv) 7x1 + 2x2 <= 35
(v) −x1 + 2x2 <= 4
x1 , x2 >= 0