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What is the solution of the inequality 12 ≤ x + 9?

Answer and explanation

Correct answer: x ≥ 3

The governing concept is maintaining an equivalent inequality while isolating the variable. Begin with 12 ≤ x + 9. Subtract 9 from both sides: 12 − 9 ≤ x, so 3 ≤ x. This is conventionally written as x ≥ 3, which is option A. The equality is included because the original symbol is ≤. Indeed, x = 3 gives 12 ≤ 3 + 9, or 12 ≤ 12, which is true. Any value greater than 3 also satisfies the relation. Option B reverses the direction and describes values at most 3, while C and D incorrectly remove the equality and/or reverse the direction. Rewriting 3 ≤ x as x ≥ 3 is a change in order only, not a change in meaning.

Related tags

Linear InequalitiesTranspositionGreater Or EqualSolution SetAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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