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Find the solution set of the inequality (7x-9\ge 3x+15).

Answer and explanation

Correct answer: (x\ge 6)

The direct answer is option A: \(x\ge6\). Start with \(7x-9\ge3x+15\). Subtract \(3x\) from both sides: \(4x-9\ge15\). Add 9: \(4x\ge24\). Divide by positive 4, so the sign does not change: \(x\ge6\). Option A is correct and includes 6 because the original sign is \(\ge\). Option B, \(x\le6\), reverses the direction without a valid reason. Option C, \(x>6\), wrongly excludes 6; checking \(x=6\) gives equality on both sides. Option D, \(x\ge-6\), uses the wrong sign for the answer and includes many values that fail the inequality. The safe method is to collect variable terms on one side and constants on the other. Since the final divisor is positive, no reversal is needed.

Related tags

Linear InequalitiesOne VariableAlgebraic Solution

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