Notes On Introduction to Linear Equation in Two Variables - CBSE Class 9 Maths
An equation in the form of 'ax + by + c = 0' is called a linear equation in two variables 'x' and 'y' where a, b and c are real numbers and a and b are not both zeros. Here a and b are called the coefficients of x and y respectively and c is called the constant term. The equation is called linear as the equation is of the first degree. The solution of a linear equation is an ordered pair of real numbers which satisfies the equation. The solution is always written as an ordered pair. Any linear equation in two variables has infinitely many solutions.

#### Summary

An equation in the form of 'ax + by + c = 0' is called a linear equation in two variables 'x' and 'y' where a, b and c are real numbers and a and b are not both zeros. Here a and b are called the coefficients of x and y respectively and c is called the constant term. The equation is called linear as the equation is of the first degree. The solution of a linear equation is an ordered pair of real numbers which satisfies the equation. The solution is always written as an ordered pair. Any linear equation in two variables has infinitely many solutions.

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