Graphical Solution of Linear Inequalities in 2 variables
A line divides the Cartesian plane into two equal parts. A point in Cartesian plane will either lie on a line or will lie in either of half planes. The region containing all the solutions of an inequality is called the solution region.
In order to identify the half plane represented by an inequality, it is just sufficient to take any point( a, b)( not online) and check whether it satisfies the inequality or not. If it satisfies, then the inequality represents the half plane and shade the region which contains the point, otherwise, the inequality represents that half plane which does not contain the point within it. For convenience, the point( 0, 0) is preferred.
Example: x + 2y > 9