Minimize & Maximize Z = 5x + 10y
Subject to,
x + 2y ≤ 120
x + y ≥ 60
x - 2y ≥ 0
x, y, ≥ 0
\(\therefore\) Z = 300 is minimum at (60, 0)
Also,
Z is maximum at two points (60, 30) & (120, 0)
\(\therefore\) Z = 600 is maximum at all points joining (60, 30) & (120, 0).