NCERT Class 9 Maths Formula CBSE Board Sample Problems Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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4. Linear Equations in Two Variables

An equation of the form ax + by + c = O, where a, b and c are real numbers, such that a and b are not both zero, is called a linear equation in two variables

Important points to Note

 S. no Points 1 A linear equation in two variable has infinite solutions 2 The graph of every linear equation in two variable is a straight line 3 x = O is the equation of the y-axis and y = O is the equation of the x-axis 4 The graph x = a is a line parallel to y -axis. 5 The graph y = b is a line parallel to x -axis 6 An equation of the type y = mx represents a line passing through the origin. 7 Every point on the graph of a linear equation in two variables is a solution of the linear equation. Moreover, every solution of the linear equation is a point on the graph

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