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If b≤12, what happens after subtracting 4 from both sides?

Answer and explanation

Correct answer: b-4≤8

An inequality compares two quantities and shows that one may be smaller than or equal to the other. A basic rule says that if the same number is added to or subtracted from both sides, the inequality sign keeps its direction. The sign changes direction only when both sides are multiplied or divided by a negative number.

Starting from b ≤ 12, subtract 4 from the left side and also from the right side. This gives b − 4 ≤ 12 − 4, and simplifying the right side gives b − 4 ≤ 8. Therefore, the stated result is correct. The alternatives with ≥ change the direction without justification, while b + 4 and 4b do not represent subtracting 4 from both sides.

Related tags

Linear InequalitiesSubtraction PropertyInequality RulesIntroduction To InequalitiesMathematicsClass 11 Mcq

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