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What is the solution of the inequality (x+6\le -1)?

Answer and explanation

Correct answer: (x\le -7)

The direct answer is A: \(x\le-7\). Start with \(x+6\le-1\). Subtract 6 from both sides: \(x+6-6\le-1-6\). The left side becomes \(x\), and the right side becomes \(-7\), so \(x\le-7\). Option A is correct. Option B reverses the inequality without a valid reason; no multiplication or division by a negative number occurred. Option C changes the inclusive sign to a strict sign and would incorrectly exclude \(x=-7\). Option D has the wrong direction and also excludes the valid boundary. Check the boundary: if \(x=-7\), then \(x+6=-1\), so equality is allowed. A quick test also confirms the direction: \(x=-8\) works, while \(x=-6\) gives 0, which does not satisfy \(0\le-1\). Remember that subtracting the same number from both sides preserves the inequality sign.

Related tags

Linear InequalitiesNegative NumbersSubtraction

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