NCERT Exemplar Class 9 Maths Unit 4 Linear Equations in Two Variables

Candidates can download NCERT Exemplar Class 9 Maths Unit 4 from this page. The exemplar has been provided by the National Council of Educational Research & Training (NCERT) and the candidates can check it from below for free of cost. It contains objective, very short answer type, short answer type, and long answer type questions. Along with it, the answer for each question has also been provided. From the NCERT Exemplar Class 9 Maths Unit 4, candidates can understand the level and type of questions that are asked in the exam.

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NCERT Exemplar Class 9 Maths Unit 4 Linear Equations in Two Variables

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NCERT Class 9 Maths Unit 4 is for Linear Equations in Two Variables. The type of questions that will be asked from NCERT Class 9 Maths Unit 4 are displayed in the below provided NCERT Exemplar Class 9 Maths Unit 4. With the help of it, candidates can prepare well for the examination.

Main Concepts and Results

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An equation is a statement in which one expression equals to another expression. An equation of the form ax + by + c = 0, where a, b and c are real numbers such that a ≠ 0 and b ≠ 0, is called a linear equation in two variables. The process of finding solution(s) is called solving an equation.
The solution of a linear equation is not affected when
(i) the same number is added to (subtracted from) both sides of the equation,
(ii) both sides of the equation are multiplied or divided by the same non-zero number.
Further, a linear equation in two variables has infinitely many solutions. The graph of every linear equation in two variables is a straight line and every point on the graph (straight line) represents a solution of the linear equation. Thus, every solution of the linear equation can be represented by a unique point on the graph of the equation. The graphs of x = a and y = a are lines parallel to the y-axis and x-axis, respectively.