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Any line divides the Cartesian plane into two parts. When deciding whether the line should be solid or dashed, think of the points on the line. If these points are not in the permitted region then it will be a dashed line, otherwise it will be a solid line. Usually this will mean that a strict inequality is dashed.
Leaders
The parallel lines represent scarification patterns.
No. Vertical lines are not.
The purpose of hidden lines is to represent edges that are not directly visible. The purpose of center lines is to represent the axes of circular features.