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Find the graphical solution for the system of linear inequation 2x + y ≤ 2, x − y ≤ 1 - Mathematics and Statistics

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प्रश्न

Find the graphical solution for the system of linear inequation 2x + y ≤ 2, x − y ≤ 1

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उत्तर

To find graphical solution, construct the table as follows:

Inequation Equation Double intercept 
form
Points
(x, y)
Region
2x + y ≤ 2 2x + y = 2 `x/1 + y/2` = 1 A(1, 0)
B(0, 2)

2(0) + 0 ≤ 2
∴ 0 ≤ 2

∴ origin side

x − y ≤ 1 x − y = 1 `x/1 + y/(-1)` = 1 A(1, 0)
C(0, −1)

0 - 0 ≤ 1
∴ 0 ≤ 1

∴ origin side

The shaded portion represents the graphical solution.

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अध्याय 1.7: Linear Programming Problems - Short Answers I

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\[4x + y \geq 20\]
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A factory makes tennis rackets and cricket bats. A tennis racket takes 1.5 hours of machine time and 3 hours of craftman's time in its making while a cricket bat takes 3 hours of machine time and 1 hour of craftman's time. In a day, the factory has the availability of not more than 42 hours of machine time and 24 hours of craftman's time. If the profit on a racket and on a bat is Rs 20 and Rs 10 respectively, find the number of tennis rackets and cricket bats that the factory must manufacture to earn the maximum profit. Make it as an LPP and solve it graphically.


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\[\text{Maximize}\text{ Z }= 3 x_1 + 5 x_2 \]
\[\text{ Subject }  to \text{ 3 } x_1 + 2 x_2 \leq 18\]
\[ x_1 \leq 4\]
\[ x_2 \leq 6\]
\[ x_1 \geq 0, x_2 \geq 0, \text{ is } \]

The point at which the maximum value of x + y subject to the constraints x + 2y ≤ 70, 2x + y ≤ 95, x ≥ 0, y ≥ 0 is obtained, is ______.


The value of objective function is maximum under linear constraints ______.


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A company manufactures two types of novelty souvenirs made of plywood. Souvenirs of type A
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A farmer has a supply of chemical fertilizer of type A which contains 10% nitrogen and 6% phosphoric acid and of type B which contains 5% nitrogen and 10% phosphoric acid. After the soil test, it is found that at least 7 kg of nitrogen and the same quantity of phosphoric acid is required for a good crop. The fertilizer of type A costs ₹ 5.00 per kg and the type B costs ₹ 8.00 per kg. Using Linear programming, find how many kilograms of each type of fertilizer should be bought to meet the requirement and for the cost to be minimum. Find the feasible region in the graph.


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Number of Students 332 317 357 392 402 405 410 427 405 438

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Aman has ₹ 1500 to purchase rice and wheat for his grocery shop. Each sack of rice and wheat costs ₹ 180 and Rupee ₹ 120 respectively. He can store a maximum number of 10 bags in his shop. He will earn a profit of ₹ 11 per bag of rice and ₹ 9 per bag of wheat.

  1. Formulate a Linear Programming Problem to maximise Aman’s profit.
  2. Calculate the maximum profit.

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