CBSE Class 11 commerce: Linear Inequalities : 1 and 2 Variables Videos | Linear Inequalities :1&2 varaibles

In case of slack inequality, the points on the line are also included in the solution set and its graph lies left (below) or right (above) of the graph of the equation that satisfy an arbitrary point in that part.
In case of strict inequality, the points on the line are not included in the set solution of inequality, hence the half plane represented by the inequality does not include the line.