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What does testing \((1,2)\) in \(3x+y\leq 9\) show?

Answer and explanation

Correct answer: it is in the solution set

Substituting \((1,2)\) gives \(3(1)+2=5\). Since \(5\leq 9\) is true, \((1,2)\) belongs to the solution set of the inequality. It is not on the boundary line, because points on the boundary must satisfy \(3x+y=9\). Exam tip: To test a point, substitute its coordinates into the inequality and check whether the result is true.

Related tags

Linear InequalitiesPoint TestSolution RegionBoundary LineCoordinate GeometryGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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