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2015-04-02T01:34:55+05:30

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See diagram.
we have to find the value of Q at the vertices of the region and at the boundaries specified by the sides of the triangle. (the constraints).


The equations of the lines OA : y = 0.
         OB :  x = 0.          and   
     AB :  x/8 + y/10  = 1      the intercept form.
             5 x + 4 y = 40

The region shaded in the diagram = the area of the triangle = feasible region.
   the region is specified by  x ≥ 0,  y ≥ 0,  5 x + 4 y ≤ 40 
             or,  y ≤ (10 - 1.25 x)

   So the region is :  0 ≤ x ≤ 8,    0 ≤ y ≤ (10 - 1.25 x)

1)
       Q = - 4 x - 3 y
           ≥ -4 x - 3 (10 - 1.25 x)
 =>  Q  ≥  - 0.25 x - 30 
     The minimum value of Q : at x = 8,  is  -32
     The maximum value of Q : at x = 0,  is x = - 30.
     Value of Q at vertex O:  -4 * 0 - 3 * 0  = 0
                     at vertex A :  - 4 * 8 - 3 * 0 = - 32
                     at vertex B:  - 4 *0 - 3 * 10 = - 30

so  Q is maximum at the origin and is 0.  Q is minimum at A (8, 0) and is -32.
======================================
2)  we have:   the region :  0 ≤ x ≤ 8,    0 ≤ y ≤ (10 - 1.25 x)

   Q = 10 x - 8 y
        ≥ 10 x - 8 (10 - 1.25 x)
   =>  Q ≥ 20 x - 80    or 20 (x - 4)
          => when x = 0, Q = -80, and when x = 8,  Q = 80.
      
     Q is 0 at the origin O.
         is  10 * 8 - 8 * 0 = 80 at  A (8, 0)
         is   10 * 0 - 8 * 10 = - 80 at  B( 0, 10)
        
Thus the maximum value is at A (8,0) :  80
   and the minimum value is at B (0, 10) :  -80.

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