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If 2x − 9 ≤ x − 4 or 5x + 3 > 18, what is the combined solution set?

Answer and explanation

Correct answer: x ∈ ℝ

For an ‘or’ statement, the combined solution is the union of the solution sets of the two inequalities. Solve the first inequality: 2x − 9 ≤ x − 4, so x ≤ 5. Solve the second: 5x + 3 > 18, hence 5x > 15 and x > 3. The union is (−∞, 5] ∪ (3, ∞). Every real number belongs to this union: numbers at most 5 satisfy the first condition, and numbers greater than 5 satisfy the second condition. Therefore the combined solution is all real numbers, so option D is correct. Option A gives only the first part, option B gives only the second part, and option C wrongly treats the conditions as contradictory.

Related tags

Linear-InequalitiesUnionOr-ConditionClass-11Algebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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