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What is the boundary line of x + 2y ≤ 10?

Answer and explanation

Correct answer: x + 2y = 10

The boundary line of a linear inequality is obtained by replacing its inequality sign with an equality sign. Therefore, changing x + 2y ≤ 10 to equality gives x + 2y = 10. This line separates the plane into the two half-planes x + 2y < 10 and x + 2y > 10. Since the original symbol is ≤, the points on the boundary itself satisfy the inequality and belong to the solution region; consequently, the line is normally drawn as a solid line. Option B describes only the strict side below the boundary, option C describes the opposite side, and option D excludes rather than identifies the boundary. Hence option A is correct.

Related tags

Linear InequalitiesBoundary LineGraphical SolutionGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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