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What is the solution of the inequality 2x + 7 ≤ 3?

Answer and explanation

Correct answer: x ≤ −2

The governing concept is performing equivalent operations on both sides of a one-variable linear inequality. Begin with 2x + 7 ≤ 3. Subtract 7 from both sides, giving 2x ≤ 3 − 7, or 2x ≤ −4. Now divide both sides by the positive number 2. Since the divisor is positive, the inequality sign does not change, and the result is x ≤ −2. The equality is included because the original symbol is ≤; therefore x = −2 must be part of the solution. Substitution verifies the boundary: 2(−2) + 7 = 3, so equality holds. A value such as x = −3 also works, while x = 0 does not. Options B and D reverse the direction incorrectly, and option C wrongly excludes −2. Hence option A is correct.

Related tags

Linear InequalitiesTwo-Step InequalityPositive DivisionAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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