# Linear Equations in one and two variables

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## Textbook

Karnataka State textbook- Chapter 9: Linear Equations in one variable

### Useful websites

3. Help students in understanding equations by making links with graphical representations of algebraic equations and expressions, and by juxtaposing differences and sameness. Encourage creation of concept and mind maps to help further with students’ understanding of mathematical concepts. Click here
4. This unit 'Solving linear equations in one variable' aims to encourage discussion on some common misconceptions about algebra and to assess students on how well they are able to solve linear equations in one variable with rational number coefficients.

## Reference Books

NCERT textbook for class 8- Chapter 2: Linear Equations in One Variable

# Teaching Outlines

## Concept 1 - Linear equation in one variable

### Notes for teachers

These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.

## Concept 2 - Linear equation in two variables

### Notes for teachers

Providing sets of 'x' and 'y' values in a spreadsheet helps students to explore a variety of linear equations in two variables.

Some sets can represent points not on a line.

# Math Fun

Constructing linear equations from real-world applications:

This activity will have students construct and solve linear equations that they derive from their everyday experiences. Students could work in pairs or groups of 3-4.

1. Construct a linear equation in which the solution is the number of apps that you have on your smart-phone. (If you do not have a smart-phone then your solution should be a= 0). The equation should involve at least three arithmetic operations.

For example: 2(a–17)=50 where 'a' represents the number of apps. Pass your paper to one of the classmates in your group. That classmate will solve the equation and verify that the answer is correct.

2. Construct another linear equation. The solution to this equation could be the number of ice-creams eaten by you in the last six months. For this equation, have a variable on each side of the equation.

For example: 6x-22=2x+10 where 'x' represent the number of ice-creams. Pass your paper another of your classmate. That classmate will solve the equation and verify that the answer is correct.

3. Construct another equation in which the solution is the number of holidays you have this semester. The equation could include fractions in the equation.

For example: 8/12 c+15=17 where c represents the number of holidays. Pass your paper to a classmate. That classmate will solve the equation and verify that the answer is correct.

4. Construct a linear equation whose solution is the current price of one kilogram of rice.

For example: 22p-202=1206 where p represents price of one kilo of of rice. Pass your paper to a classmate. That classmate will solve the equation and verify that the answer is correct.

5. Similarly various groups can create such equations, exchange with each other and try solving them.