If the line on a graph is dotted the line is NOT part of the solution?

A dotted line on a graph typically indicates that the line itself does not include the points that lie on it, meaning those points are not part of the solution set. This is often used in inequalities to signify that the boundary is not included in the solution. For example, in the inequality (y < mx + b), the line (y = mx + b) would be represented by a dotted line to show that the area below the line is included in the solution but the line itself is not.