Class 8 Maths – Chapter 2
Linear Equations in One Variable

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 Introduction

An equation is a mathematical statement that shows the equality of two expressions. In this chapter, we study linear equations involving only one variable.

📌 What is a Linear Equation?

A linear equation in one variable is an equation that can be written in the form:

ax + b = 0

where a and b are constants and x is the variable.

📐 Example 1

Solve: 2x + 5 = 15

Solution:

2x + 5 = 15
2x = 15 − 5
2x = 10
x = 10 ÷ 2
x = 5

📝 Important Points

• Always perform the same operation on both sides of the equation.
• The goal is to isolate the variable.
• Check your answer by substituting it back.

🧠 Try Yourself

1) x − 7 = 13
2) 5x = 35
3) 3x + 4 = 19

📘 Prepared by Shaktimatha Learning | Class 8 Maths