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Question

Minimize z=6x+2y, Subject to x+2y3,x+4y4,3x+y3,x0,y0.

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Solution

Inequality

x+2y>=3

x+4y>=4

3x+y>=3

x>=0

y>=0

Corresponding equation

x+2y=3

x+4y=4

3x+y=3

x=0

y=0

Intersection of line with x-axis

(3,0)

(4,0)

(1,0)

-

-

Intersection of line with y-axis

(0,1.5)

(0,1)

(0,3)

-

-

Region

Non origin side

Non origin side

Non origin side

Origin side

Origin side

Z at A(0,0)=6(0)+2(0)=0 (minimum value)

Z at B(2,0.5)=6(2)+2(0.5)=13

Z at C(3,0)=6(3)+2(0)=18

Z at D(0,1)=6(0)+2(1)=2


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