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Is the boundary line \(2x+3y=18\) included in \(2x+3y\ge 18\)?

Answer and explanation

Correct answer: yes

The symbol \(\ge\) means “greater than or equal to.” Hence, every point satisfying \(2x+3y=18\) also satisfies \(2x+3y\ge 18\). Therefore, the boundary line belongs to the solution region and is drawn as a solid line. With \(>\), the boundary would not be included and would be drawn dashed. Exam tip: use a solid boundary line for \(\ge\) or \(\le\).

Related tags

Linear InequalitiesBoundary LineGraphical SolutionSolid LineTwo VariablesClass 11Graphical Solution Of Linear Inequalities In Two VariablesMathematics

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