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**Solve the following L.P.P graphically:**

Maximize: Z = 10x + 25y

Subject to: x ≤ 3, y ≤ 3, x + y ≤ 5, x ≥ 0, y ≥ 0

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#### Solution

First we draw the lines AB, CD and EF whose equations are x = 3, y = 3 and x + y = 5 respectively.

Line |
Equation |
Point on the X-axis |
Point on the Y-axis |
Sign |
Region |

AB | x = 3 | A(3,0) | - | ≤ | origin side of line AB |

CD | y = 3 | - | D(0,3) | ≤ | origin side of line CD |

EF | x + y = 5 | E(5,0) | F(0,5) | ≤ | origin side of line EF |

The feasible region is OAPQDO which is shaded in the figure.

The vertices of the feasible region are O (0,0), A (3, 0), P, Q and D (0, 3)

P is the point of intersection of the lines x + y = 5 and x = 3

Substituting x = 3 in x + y = 5, we get,

3+ y=5

y = 2

P≡ (3, 2)

Q is the point of intersection of the lines x + y = 5 and y = 3

Substituting y = 3 in x + y = 5, we get,

x + 3 = 5

x = 2

Q ≡ (2,3)

The values of the objective function z = 10x + 25y at these vertices are

Z(O) =10(0)+ 25(0)= 0

Z(A) =10(3) + 25(0) = 30

Z(P) =10(3) + 25(2) = 30 + 50 = 80

Z(Q) =10(2) + 25(3) = 20 + 75 = 95

Z(D) =10(0) + 25(3) =75

Z has max imumvalue 95, when x = 2 and y = 3.

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