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NCERT Class 9 Maths Formula CBSE Board Sample Problems Part 4
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 |