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Which is the interval form of \(5x-1\le 14\)?

Answer and explanation

Correct answer: \((-\infty,3]\)

Adding 1 to both sides of \(5x-1\le14\) gives \(5x\le15\). Dividing by 5 gives \(x\le3\). Hence, all real numbers less than or equal to 3 are included, represented by \((-\infty,3]\). Option A excludes 3, so it represents \(x<3\). Exam tip: Use a square bracket at an endpoint when \(\le\) or \(\ge\) includes that endpoint.

Related tags

Linear InequalitiesInterval NotationNumber LineLess Than Or EqualRepresentation On Number LineMathematicsClass 11 Mcq

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