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

Linear Equations in Two Variables
S. noPoints
1A linear equation in two variable has infinite solutions
2The graph of every linear equation in two variable is a straight line
3x = O is the equation of the y-axis and y = O is the equation of the x-axis
4The graph x = a is a line parallel to y -axis.
5The graph y = b is a line parallel to x -axis
6An equation of the type y = mx represents a line passing through the origin.
7Every 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