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The solution of ( 0.4x-1.2\leq 0.1x+2.1 ) is:

Answer and explanation

Correct answer: \(x\leq 11\)

Multiply both sides by 10 to remove the decimals: \(4x-12\leq x+21\). Collecting the \(x\)-terms on one side gives \(3x\leq 33\), so \(x\leq 11\). The option \(x<11\) is not correct because \(x=11\) makes both sides equal, and equality is included in \(\leq\). Exam tip: multiplying or dividing an inequality by a positive number does not reverse its sign.

Related tags

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

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