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12 grade maths others

Solve the following Linear Programming Problems graphically:

Minimize: Z = x + 2y

Subjected to:

2x + y ≥ 3
x + 2y ≥ 6
x, y ≥ 0

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1 Year agoGrade
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1 Answer

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1 Year ago

To solve the given Linear Programming Problem (LPP) graphically, we need to minimize the objective function Z = x + 2y, subject to the following constraints:

2x + y ≥ 3
x + 2y ≥ 6
x ≥ 0, y ≥ 0
Let's break it down step by step:

Step 1: Plot the constraints
We need to convert each constraint into an equation to plot the lines on the graph.

Constraint 1: 2x + y ≥ 3
Rearrange the inequality as an equation: 2x + y = 3 Solve for y: y = 3 - 2x

This is a straight line with slope -2 and y-intercept 3.

Constraint 2: x + 2y ≥ 6
Rearrange the inequality as an equation: x + 2y = 6 Solve for y: y = (6 - x) / 2

This is a straight line with slope -1/2 and y-intercept 3.

Constraint 3: x ≥ 0, y ≥ 0
This means that the feasible region is in the first quadrant of the coordinate plane.

Step 2: Graph the constraints
Plot the lines 2x + y = 3 and x + 2y = 6 on a graph.
The feasible region is the area where all constraints are satisfied simultaneously.
Since both x and y are non-negative, the feasible region will be in the first quadrant.
Step 3: Identify the corner points (vertices) of the feasible region
The corner points of the feasible region are where the constraint lines intersect. We need to find the points of intersection.

Intersection of 2x + y = 3 and x + 2y = 6
Solve the system of equations:

2x + y = 3
x + 2y = 6
Multiply the first equation by 2 to make the coefficients of y the same: 4x + 2y = 6 Now subtract the second equation from this: (4x + 2y) - (x + 2y) = 6 - 6 3x = 0 x = 0

Substitute x = 0 into 2x + y = 3: 2(0) + y = 3 y = 3

So, the intersection point is (0, 3).

Intersection of 2x + y = 3 and x = 0
Substitute x = 0 into 2x + y = 3: 2(0) + y = 3 y = 3

So, the point is (0, 3), which is the same as the previous intersection point.

Intersection of x + 2y = 6 and x = 0
Substitute x = 0 into x + 2y = 6: 0 + 2y = 6 y = 3

So, the point is (0, 3), which is the same as before.

Intersection of x + 2y = 6 and y = 0
Substitute y = 0 into x + 2y = 6: x + 2(0) = 6 x = 6

So, the intersection point is (6, 0).

Step 4: Evaluate the objective function Z = x + 2y at the corner points
Now, we evaluate the objective function at the corner points (0, 3) and (6, 0).

At (0, 3): Z = 0 + 2(3) = 6

At (6, 0): Z = 6 + 2(0) = 6

Step 5: Find the minimum value of Z
The objective function Z is minimized when Z = 6 at both (0, 3) and (6, 0).

Final Answer:
The minimum value of Z = x + 2y is 6, and it occurs at the points (0, 3) and (6, 0).


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Step 1: Building Number Understanding

Before children start solving sums, they must first understand numbers clearly.

Young learners should become familiar with:

  • Counting numbers

  • Recognising numbers

  • Understanding the value of numbers

Teachers often use simple activities such as counting objects, toys, or fruits to help children understand numbers.

For example, parents can ask questions like:

  • How many apples are on the table?

  • Can you count the pencils in your bag?

These small activities help children connect numbers with real objects.

Step 2: Learning Addition (Basic Sums)

Addition is usually the first mathematical operation children learn.

Addition means combining numbers together.

For example:

2 + 3 = 5

Teachers often teach addition using objects.

Example:

If a child has 2 pencils and receives 3 more pencils, the total becomes 5 pencils.

Using objects makes the concept easier to understand.

Simple addition practice

Parents can practice with children using:

  • fingers

  • small toys

  • beads

  • fruits

Once children understand the concept, they can move on to written sums.

Step 3: Understanding Subtraction

Subtraction means taking away from a number.

Example:

5 − 2 = 3

Teachers often explain subtraction using real situations.

Example:

If a child has 5 chocolates and gives 2 chocolates to a friend, how many chocolates remain?

This approach helps children understand subtraction more clearly.

Parents can encourage children to think about subtraction in everyday situations.

Step 4: Learning Multiplication

Multiplication is often introduced after children become comfortable with addition.

Multiplication means repeated addition.

Example:

3 × 4 means adding 4 three times.

4 + 4 + 4 = 12

Teachers often explain multiplication using groups.

Example:

If there are 3 groups of 4 apples, the total number of apples is 12.

Using pictures or objects helps children visualise multiplication easily.

Step 5: Multiplication Tables (Learning Vaaipaadu)

In Tamil education systems, multiplication tables are often called “vaaipaadu”.

Memorising tables helps children solve multiplication problems faster.

Common tables include:

2 × 1 = 2
2 × 2 = 4
2 × 3 = 6

Tables usually begin from 2 and go up to 10 or 12.

Teachers often encourage children to practice tables through:

  • repetition

  • rhythm or songs

  • daily practice

Parents can make table learning interesting by asking questions during daily activities.

For example:

If one box contains 5 chocolates, how many chocolates are there in 3 boxes?

These small questions strengthen table knowledge.

Step 6: Understanding Division

Division is the opposite of multiplication. It means sharing or splitting numbers equally.

Example:

12 ÷ 3 = 4

Teachers explain division using sharing examples.

Example:

If 12 sweets are shared equally among 3 children, each child receives 4 sweets.

This helps children understand the concept of division clearly.

Making Basic Maths Skills Practice Fun at Home

Mathematics should not feel like a stressful subject for children. Parents can help children enjoy maths through simple activities.

Some useful methods include:

Asking children to count objects around the house

Practicing tables during daily routines

Solving small sums during shopping or cooking

Playing number-based games

When maths becomes part of daily life, children learn faster.

Encouraging Confidence in Maths

Some children feel nervous about mathematics because they fear making mistakes.

Teachers usually encourage students to see mistakes as part of learning.

Parents can support children by:

  • appreciating their effort

  • encouraging them to try again

  • avoiding comparison with other students

Confidence grows when children feel supported.

Balancing Practice and Understanding

Memorising formulas or tables alone is not enough. Children should also understand the logic behind the calculations.

For example, a child who understands multiplication as repeated addition will find division easier to learn.

Teachers often recommend a balanced approach:

  • understanding concepts

     

  • regular practice

     

  • problem-solving exercises

This combination helps children build strong mathematical skills.

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