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What is the solution of (2.5(2x-1)\ge 1.5(x+3))?

Answer and explanation

Correct answer: \(x\ge 2\)

Expanding the left side gives \(2.5(2x-1)=5x-2.5\), while the right side gives \(1.5(x+3)=1.5x+4.5\). Hence, \(5x-2.5\ge 1.5x+4.5\), so \(3.5x\ge 7\). Since \(3.5\) is positive, dividing both sides by it does not reverse the inequality sign, giving \(x\ge 2\). The closest distractor is \(x>2\), but \(x=2\) makes both sides equal, so it must be included. Exam tip: An inequality sign changes direction only when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesOne VariableDecimal CoefficientsAlgebraic SolutionClass 11Algebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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