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What is the solution of the inequality 18 − 4x > 2?

Answer and explanation

Correct answer: x < 4

The governing rule is that dividing or multiplying an inequality by a negative number reverses its sign. Start with 18 − 4x > 2. Subtract 18 from both sides: −4x > −16. Now divide both sides by −4. Because −4 is negative, the greater-than sign changes to less-than, giving x < 4. Thus option A is correct. The boundary value x = 4 is not included because the original sign is strict: substituting 4 gives 18 − 16 = 2, not a value greater than 2. Option B is the common error of forgetting sign reversal. Options C and D incorrectly use a non-strict sign, and D also has the wrong direction.

Related tags

Linear InequalitiesNegative DivisionSign ReversalStrict InequalityAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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