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What is the solution of the inequality \(3(x-6)\le 12\)?

Answer and explanation

Correct answer: (x\le 10)

The direct answer is A: x≤10. Start with 3(x−6)≤12. Divide both sides by the positive number 3: x−6≤4. Add 6 to both sides: x≤10. The inequality sign does not reverse because division was by a positive number; it reverses only when multiplying or dividing by a negative number. Option A is correct. Option B reverses the direction without reason. Option C changes ≤ into < and wrongly excludes 10; substituting x=10 gives equality, so 10 must be included. Option D both reverses the direction and excludes the boundary. A quick check with x=10 gives 3(4)=12, which satisfies ≤. Memory cue: positive division keeps the sign; negative division flips it.

Related tags

Linear InequalitiesBracketsLess Than Equal

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