1) The minimum value of Z=5x+8y subject to x+y≥5,0≤x≤4,y≥2,x≥0,y≥0 is A) 40 B) 36 C) 20 D) 31 Answer: Option DExplanation: Given minimise z=5x+8y Subject to constants x+y≥5 0≤x≤4,y≥2,x≥0,y≥0 corner point z=5x+8y A (3,2) 15+16=31 B(4,2) 20+16=36 C(0,5) 0+40=40 ∴ Minimum value=31