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Boundary

Concept

Boundary

Boundary Point

The boundary point is the point at the edge of a number line inequality.

The boundary point for the strict inequality is

Boundary Line

A boundary line is a line that defines the edge of an area. Usually, this refers to the line that splits a plane in half in the graph of a linear inequality.
In the example above, the line is the boundary line of the non-strict inequality

Boundary Curve

A boundary curve is the same as a boundary line in every way except that the word curve can be used to describe inequalities whose boundaries are not linear functions.
In this example, the curve is the boundary curve of the strict inequality