If two corner points produce the same maximum (or minimum) value
of the objective function, then every point on the line segment joining these
points will also give the same maximum (or minimum) value EXERCISE 12 1
Solve the following Linear Programming Problems graphically:
1 Maximise Z =  3x + 4y
subject to the constraints : x + y ≤ 4, x  ≥  0, y ≥ 0