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If (x>2), which lower-bound statement for (3x+4) is correct?

Answer and explanation

Correct answer: (3x+4>10)

The direct answer is A: \(3x+4>10\). Start with \(x>2\). Multiplying both sides by the positive number 3 keeps the inequality direction: \(3x>6\). Adding 4 to both sides gives \(3x+4>10\). The inequality is strict because \(x\) is strictly greater than 2; it cannot equal 2. Option A is correct. Option B, \(3x+4\ge10\), is weaker and is not the exact conclusion: equality would require \(x=2\), which is forbidden. Option C reverses the relationship and is false; for example, if \(x=3\), the expression is 13, not less than 10. Option D says the expression always equals 10, but its value changes with \(x\). Remember: multiplying or dividing by a positive number keeps the sign; adding or subtracting also keeps it. Only multiplication or division by a negative number reverses an inequality.

Related tags

Linear-InequalitiesLower-BoundStrict-Inequality

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