How to Solve Linear Equations — Step by Step Guide
Solve equations like 2x + 3 = 7 step by step. This guide covers Class 7 to 9.
Step-by-Step Method
- 1
Simplify both sides of the equation. Remove brackets and combine like terms.
- 2
Move all terms with the variable to one side and constants to the other using addition or subtraction.
- 3
Divide both sides by the coefficient of the variable to isolate x.
- 4
Substitute the value back into the original equation to check your answer.
Worked Example
Problem: Solve 3x + 7 = 22
Solution: 3x = 22 - 7 = 15. x = 15/3 = 5. Check: 3(5) + 7 = 15 + 7 = 22.
Common Mistakes to Avoid
- ✗
Forgetting to change the sign when moving terms across the equals sign.
- ✗
Not applying an operation to both sides of the equation equally.
- ✗
Making errors when dealing with fractions — multiply everything by the LCM of denominators first.
- ✗
Skipping the verification step.
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Frequently Asked Questions
- How do I solve Linear Equations problems?
- Simplify both sides of the equation. Remove brackets and combine like terms. Move all terms with the variable to one side and constants to the other using addition or subtraction.
- What are common mistakes in Linear Equations?
- Forgetting to change the sign when moving terms across the equals sign. Not applying an operation to both sides of the equation equally.
- Which class covers Linear Equations?
- Linear Equations is typically taught in Class 7, 8, 9. SparkEd has free practice for all these grades.
- Where can I practise Linear Equations for free?
- SparkEd offers free chapter-wise practice for Linear Equations aligned to CBSE, ICSE, and IB curricula. Visit sparkedmaths.com to start.
SparkEd Maths — sparked.coms@gmail.com — www.sparkedmaths.com