## Welcome to the world of algebraic expressions and linear equations with the CBSE Class 10 Mathematics chapter "Pair of Linear Equations in Two Variables." This pivotal chapter uncovers the techniques to solve equations that have two different variables.

### Introduction to CBSE Class 10 Mathematics Chapter "Pair of Linear Equations in Two Variables"

The chapter “Pair of Linear Equations in Two Variables” focuses on equations that express a linear relationship between two variables. In the CBSE Class 10 Mathematics curriculum, students learn about pairs of linear equations and the various methods for finding their solutions. The chapter begins by explaining what constitutes a linear equation in two variables, taking the standard form ax + by + c = 0, where a, b, and c are real numbers, and x and y are the variables.

Students then explore how to graph these equations on a coordinate plane and understand the significance of the point where two lines intersect, which represents the solution to the equation pair. The chapter delves into methods of solving these equations, including substitution, elimination, and cross-multiplication, each with its step-by-step procedure.

Additionally, the chapter discusses the conditions under which the pair of equations is consistent, inconsistent, or dependent. It also introduces the concept of algebraic methods for solving a pair of linear equations and the graphical method, providing a visual understanding of the solutions. Through solved examples and practice exercises, students gain a firm understanding of how to approach and solve pairs of linear equations.

**Assignments for CBSE Class 10 Mathematics Chapter “Pair of Linear Equations in Two Variables”**

**Graphing Linear Equations**: Plot the graphs of different linear equations and find the point of intersection.**Solving by Substitution**: Practice solving pairs of linear equations by the substitution method.**Elimination Method Exercise**: Use the elimination method to solve given sets of linear equations and verify the solutions graphically.**Cross-Multiplication Mastery**: Solve complex pairs of linear equations using the cross-multiplication method.**Real-World Problems**: Formulate and solve linear equations based on real-life scenarios, such as budgeting or simple interest calculations.

**Conclusion**

“Pair of Linear Equations in Two Variables” is a chapter that equips CBSE Class 10 students with essential algebraic skills. The knowledge gained from this chapter is not just limited to academic pursuits but also extends to solving everyday problems and understanding the quantitative relationships in various fields such as economics, science, and engineering.

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## Questions and Answers for CBSE Class 10 Mathematics Chapter "Pair of Linear Equations in Two Variables"

**Q1: What is a linear equation in two variables?**

**ANS**: A linear equation in two variables is an algebraic equation that represents a straight line when plotted on a graph, typically written in the form ax + by + c = 0.**Q2: How can you determine if a pair of linear equations is consistent?**

**ANS**: A pair of linear equations is consistent if they have at least one solution, meaning the lines represented by the equations intersect at a point on the graph.**Q3: What methods can be used to solve a pair of linear equations?**

**ANS**: The methods include graphing, substitution, elimination, and cross-multiplication.**Q4: What does it mean for a pair of linear equations to be dependent?**

**ANS**: Dependent equations have infinitely many solutions because they represent the same line graphically.**Q5: What is the elimination method?**

**ANS**: The elimination method involves adding or subtracting the equations to eliminate one variable, making it possible to solve for the other variable.**Q6: How is the cross-multiplication method carried out?**

**ANS**: In the cross-multiplication method, the coefficients of x and y and the constants are cross-multiplied to form two separate equations, which can then be solved to find the values of x and y.**Q7: Can a system of linear equations have exactly two solutions?**

**ANS**: No, a system of linear equations in two variables can have only one solution, infinitely many solutions, or no solution.**Q8: Why is graphing a useful method for solving linear equations?**

**ANS**: Graphing provides a visual representation of the solutions, making it easier to understand the relationship between the equations and their solutions.**Q9: What is a real-life application of solving a pair of linear equations?**

**ANS**: Real-life applications include calculating budgets, planning diets, and predicting outcomes in business and science.**Q10: How do you verify the solution of a pair of linear equations?**

**ANS**: The solution can be verified by plugging the values back into the original equations to see if they satisfy both equations.