C= 8x+6y
subject to constraints:
3x+2y > 160
5x+2y > 200
x+2y >80
x>0
y>0
This question is on graphing and shadowing the feasible region. I found all 4 points A=(80,0) B=(40,20) C=(20,50) D=(0,100) which are correct answers. The only thing i cant find is the isocost lines. The answer are C=400 and C=600. I cant draw or show my graphs here but anyone have idea how can i manually find the isocosts without graphing??