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For the line 3x − 2y = 6, testing the origin gives 0 ≤ 6. Which half-plane should be taken for 3x − 2y ≤ 6?

Answer and explanation

Correct answer: Half-plane containing the origin

To graph a linear inequality in two variables, first draw its boundary line and then test a point that is not on the line. The origin is convenient here. Substituting (0, 0) into 3x − 2y ≤ 6 gives 0 − 0 ≤ 6, or 0 ≤ 6, which is true. Therefore the entire half-plane containing the origin satisfies the inequality and must be selected. Because the sign is ≤ rather than <, the boundary line 3x − 2y = 6 is included and should be drawn as a solid line. The opposite half-plane contains points that fail the inequality; selecting only the boundary or both sides would not describe the solution set.

Related tags

Linear InequalitiesHalf-PlaneTest PointGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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