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Solve the LPP graphically:
Minimize Z = 4x + 5y
Subject to the constraints 5x + y ≥ 10, x + y ≥ 6, x + 4y ≥ 12, x, y ≥ 0
Solution: Convert the constraints into equations and find the intercept made by each one of it.
Inequations | Equations | X intercept | Y intercept | Region |
5x + y ≥ 10 | 5x + y = 10 | ( ___, 0) | (0, 10) | Away from origin |
x + y ≥ 6 | x + y = 6 | (6, 0) | (0, ___ ) | Away from origin |
x + 4y ≥ 12 | x + 4y = 12 | (12, 0) | (0, 3) | Away from origin |
x, y ≥ 0 | x = 0, y = 0 | x = 0 | y = 0 | 1^{st} quadrant |
∵ Origin has not satisfied the inequations.
∴ Solution of the inequations is away from origin.
The feasible region is unbounded area which is satisfied by all constraints.
In the figure, ABCD represents
The set of the feasible solution where
A(12, 0), B( ___, ___ ), C ( ___, ___ ) and D(0, 10).
The coordinates of B are obtained by solving equations
x + 4y = 12 and x + y = 6
The coordinates of C are obtained by solving equations
5x + y = 10 and x + y = 6
Hence the optimum solution lies at the extreme points.
The optimal solution is in the following table:
Point | Coordinates | Z = 4x + 5y | Values | Remark |
A | (12, 0) | 4(12) + 5(0) | 48 | |
B | ( ___, ___ ) | 4( ___) + 5(___ ) | ______ | ______ |
C | ( ___, ___ ) | 4( ___) + 5(___ ) | ______ | |
D | (0, 10) | 4(0) + 5(10) | 50 |
∴ Z is minimum at ___ ( ___, ___ ) with the value ___
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Solution
Convert the constraints into equations and find the intercept made by each one of it.
Inequations | Equations | X intercept | Y intercept | Region |
5x + y ≥ 10 | 5x + y = 10 | (2, 0) | (0, 10) | Away from origin |
x + y ≥ 6 | x + y = 6 | (6, 0) | (0, 6) | Away from origin |
x + 4y ≥ 12 | x + 4y = 12 | (12, 0) | (0, 3) | Away from origin |
x, y ≥ 0 | x = 0, y = 0 | x = 0 | y = 0 | 1^{st} quadrant |
∵ Origin has not satisfied the inequations.
∴ Solution of the inequations is away from origin.
The feasible region is unbounded area which is satisfied by all constraints.
In the figure, ABCD represents
The set of the feasible solution where
A(12, 0), B(4, 2), C (1, 5) and D(0, 10).
The coordinates of B are obtained by solving equations
x + 4y = 12 and x + y = 6
The coordinates of C are obtained by solving equations
5x + y = 10 and x + y = 6
Hence the optimum solution lies at the extreme points.
The optimal solution is in the following table:
Point | Coordinates | Z = 4x + 5y | Values | Remark |
A | (12, 0) | 4(12) + 5(0) | 48 | |
B | (4, 2) | 4(4) + 5(2) | 26 | minimum |
C | (1, 5) | 4(1) + 5(5) | 29 | |
D | (0, 10) | 4(0) + 5(10) | 50 |
∴ Z is minimum at B (4, 2) with the value 26
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