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What is the correct solution of 4−7x>18?

Answer and explanation

Correct answer: x<−2

The governing concept is the sign reversal that occurs when dividing an inequality by a negative number. Start with 4−7x>18 and subtract 4 from both sides, obtaining −7x>14. Dividing by −7 reverses the inequality from > to <, so x<−2. A boundary check shows that x=−2 gives 4−7(−2)=18, but equality is not allowed; therefore −2 must be excluded. A value such as x=−3 gives 25>18 and confirms the direction. Option B forgets the reversal, while C and D use a positive boundary or incorrect direction. Thus the exact solution is x<−2, option A.

Related tags

Linear-InequalityNegative-DivisionSign-ReversalAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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