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If (x\in\mathbb{Z}) and (4x-1>15), what is the least possible (x)?

Answer and explanation

Correct answer: (5)

The direct answer is A: 5. Start with 4x−1>15. Add 1 to both sides: 4x>16. Divide by the positive number 4: x>4. Because x must be an integer, the smallest integer greater than 4 is 5. A is correct, and checking it gives 4(5)−1=19>15. B, 4, is not allowed because 4(4)−1=15, and 15 is not greater than 15; the inequality is strict. C, 6, satisfies the inequality but is not the least possible value. D, 3, gives 11>15, which is false. Dividing by a positive number keeps the sign unchanged; if we divided by a negative number, the sign would reverse, but that does not happen here. The integer condition is essential: among real numbers there is no least real number greater than 4, but among integers the next value is 5. Memory cue: for x>4 with x∈Z, move to the next integer, not 4.

Related tags

Least-IntegerStrict-InequalitySolution

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