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If x ∈ ℤ and 4x + 9 < 1, what is the greatest possible value of x?

Answer and explanation

Correct answer: −3

The governing concept is solving a strict linear inequality and then applying the integer restriction. Start with 4x + 9 < 1. Subtracting 9 gives 4x < −8. Since division by the positive number 4 does not reverse the inequality, x < −2. Because x must be an integer, the greatest integer strictly less than −2 is −3. Thus option D is correct. The value −2 is not permitted because it produces equality: 4(−2) + 9 = 1, whereas the condition requires a value less than 1. Values 0 and −1 are greater than −2 and clearly fail the inequality. The remaining acceptable integers are −3, −4, −5 and so on, with −3 the greatest.

Related tags

Integer-SolutionStrict-InequalityGreatest-ValueIntroduction To InequalitiesLinear InequalitiesMathematicsClass 11 Mcq

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