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What is the solution of 2(3x + 1) < 5x + 9?

Answer and explanation

Correct answer: x < 7

The governing concept is solving a linear inequality using the distributive law and collecting like terms. Expand the left side: 2(3x + 1) = 6x + 2. The inequality becomes 6x + 2 < 5x + 9. Subtract 5x from both sides to get x + 2 < 9, and then subtract 2 to obtain x < 7. Therefore option A is correct. No sign reversal occurs because the variable is not divided by a negative number; effectively, the final coefficient of x is the positive number 1. Options B and D reverse the inequality direction, while options C and D also incorrectly change the sign of the boundary value. A quick check confirms the result: x = 0 satisfies 2 < 9, whereas x = 8 gives 50 < 49, which is false.

Related tags

Linear InequalityDistributive LawAlgebraic SolutionAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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