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If (a<b) and (k>0), which statement is correct?

Answer and explanation

Correct answer: (ak<bk)

An inequality preserves its direction when both sides are multiplied by a positive number. Since \(a<b\) and \(k>0\), multiplying each side by k gives \(ak<bk\). The positivity of k is essential: multiplication by a negative number would reverse the sign, while multiplication by zero would destroy the strict comparison.

Therefore option A, \(ak<bk\), follows directly from the order rule for positive multiplication. Adding k to both sides would also preserve direction and give \(a+k<b+k\), but that is not what option C states. Similarly, subtracting k gives \(a-k<b-k\), not the reversed inequality in option D. Thus A is the correct choice.

Related tags

Linear InequalitiesPositive MultiplierProperty

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