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CBSE Notes Class 7 Maths Chapter 4 Simple Equations
In CBSE Class 7 Maths Chapter 4: Simple Equations, students are introduced to the concept of equations—a fundamental building block of algebra. This chapter lays the foundation for solving real-life problems using algebraic expressions and equations. It teaches how to form and solve simple equations, understand the equality between two mathematical expressions, and use equations as a tool for problem-solving.
This topic not only sharpens logical thinking but also prepares students for higher-level algebraic concepts they will encounter in the future.
1.0Download CBSE Class 7 Maths Chapter 4 Simple Equations Notes : Free PDF
Students can download free PDF notes for CBSE Class 7 Maths Chapter 4 – Simple Equations. This resource is designed for easy comprehension of important concepts and is accessible from anywhere. Perfect for quick revisions, these notes cover balancing equations, Linear equation, and Solved Examples as per the NCERT syllabus.
2.0Introduction to Simple Equations
- Variables: In a mathematical equation, a variable is a letter or alphabet used in place of an unspecified number in expressions, equations or formulas. That is, in the given expression a variable act as a placeholder for the unknown number. Generally, a single letter is used to represent a variable. Ex- x, y, z, t etc.
- Expression: An expression or algebraic expression is a mathematical statement made up of numbers, variables, and arithmetic operations (such as +, –, ×, ÷). For example, in the expression 4m + 5, the terms are 4m and 5, with m being the variable. These terms are connected by the arithmetic operation +.
- Equations: An equation is a mathematical statement that shows the equality between two expressions and includes one or more unknown variables.
3.0Linear Equations or Simple Equations
An equation involving only a linear polynomial is called a linear equation.
Example: 4x + 2 = –2
Solution of Linear Equation: The value of a variable that satisfies the equation and makes both sides equal is called the solution or root of the equation.
Example:
The solution of the equation 9 + x = 13 is 4. In other words, the value of x, called the variable, which satisfies the given equation is called the solution or root of the equation.
Also Read: Linear Equation in One Variable
4.0Balancing an Equation
To solve an equation, both sides must remain balanced. Follow these four key rules:
- Addition: Adding the same number to both sides keeps the equation balanced.
- Subtraction: Subtracting the same number from both sides maintains equality.
- Multiplication: Multiply both sides by the same number to preserve balance.
- Division: To preserve equality, divide both sides of the equation by the same non-zero number.
5.0Transposing Method
In this method, we transpose numbers from one side of the equation to the other, moving all terms with variables to one side and constants to the other. When transposing:
- A positive number becomes negative, and a negative number becomes positive.
- Similarly, multiplication changes to division, and division changes to multiplication.
Transposition helps in isolating the variable and solving simple equations efficiently.
6.0From Solution to Equation
We cannot only solve an equation, but also can make equations by following the reverse path. Also, given an equation, we can get one solution but with the given solution we can make many equations.
- What’s a Solution and a Variable?
A solution is the value that satisfies an equation, while a variable (like x or y) is a letter that stands for an unknown number. For example, if we know that x = 5, we can create different equations, like 2x + 3 = 13.
- Turning Word Problems into Equations:
When you read a word problem, look for important details. Identify what the problem is asking for and what the unknowns are. For instance, if the problem says, “A number increased by 4 equals 10,” you can let x represent that number and write it as: x + 4 = 10
- Balancing the Equation:
To find the value of x, you need to keep the equation balanced. This means doing the same thing to both sides. For example, if you have x + 4 = 10, you can subtract 4 from both sides to isolate x:
x + 4 – 4 = 10 – 4
This simplifies to x = 6.
7.0Solved Examples on Simple Equations
Example 1: Check whether the value given in the bracket is a solution (root) of the given equation or not?
y – 11 = 4 (at y = 16)
Solution:
Substituting y = 16 in the given equation, we get
L.H.S. = 16 – 11 = 5 ≠ R.H.S.
Example 2: Solve the following equations without transposing: 2x + 14 = 26
Solution:
2x + 14 = 26
Subtract 14 from both sides
2x + 14 – 14 = 26 – 14
2x = 12
Divide both the sides by 2
x = 6
Example 3: Solve the equation 3 + 2(p – 7) = 9
Solution:
3 + 2(p – 7) = 9
2(p – 7) = 9 – 3
2(p – 7) = 6
p – 7 = 3
p = 3 + 7
p = 10
Example 4: Solve
Solution:
We have:
Removing the brackets, we get
Multiplying both sides by 21, the LCM of 7 and 3, we get
–21x + 3(3x – 4) = 7(4x – 27) – 63
–21x + 9x – 12 = 28x – 189 – 63
–12x –12 = 28x – 252
–12x – 28x = –252 + 12 [by transposing 28x on LHS & –12 on RHS]
–40x = –240 ⇒ x = 6 [on dividing both sides by –40].
x = 6 is a solution of the given equation.
Example 5: If x = 8, then find the equation.
Solution:
We have, x = 8
x + 5 = 8 + 5 (Adding 5 to both sides)
x + 5 = 13
Hence, x + 5 = 13 is an equation for x = 8
Another way,
x = 8
x × 4 = 8 × 4 (Multiply 4 to both sides)
4x = 32
Hence, 4x = 32 is also an equation for x = 8.
In this way, we can find as many equations as we want for the solution x = 8.
8.0Key Features of Class 7 Maths Chapter 4 : Simple Equations
- Introduction to Equations – Understand the basics of equations and how they differ from expressions.
- Balancing Equations – Learn the concept of balancing both sides of an equation using inverse operations.
- Solving Simple Equations – Step-by-step methods to solve linear equations in one variable.
- Practical Applications – Real-life word problems that demonstrate the use of equations in daily scenarios.
- NCERT-Based Exercises – Practice problems and examples aligned with the NCERT curriculum for better exam preparation.
- Interactive Learning – Engaging activities and examples to strengthen problem-solving skills.