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Boundary line
The line obtained by replacing an inequality sign with an equals sign. It separates the plane into regions that do or do not satisfy the inequality.
Feasible region
The set of all points that satisfy every inequality in a system (all constraints). Graphically, it is the overlap region, often a polygon.
Solution set
The set of all values of the variable(s) that make an inequality (or a system of inequalities) true.
System of inequalities
A set of two or more inequalities that must all be true at the same time. The solution set is the overlap of the individual solution regions.