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Which value is not a solution of (2x+1<9)?

Answer and explanation

Correct answer: (x=4)

The direct answer is option A, x = 4. First solve the inequality: 2x + 1 < 9. Subtract 1 from both sides: 2x < 8. Divide by positive 2: x < 4. Thus every number smaller than 4 is a solution, but 4 itself is not included because the sign is strictly less than, not less than or equal to. Option A is therefore the value that is not a solution. Option B, x = 0, works because 2(0)+1 = 1 < 9. Option C, x = −2, works because −4+1 = −3 < 9. Option D, x = 3, works because 6+1 = 7 < 9. The boundary value is excluded in a strict inequality. Memory cue: a < sign leaves the endpoint out.

Related tags

Linear InequalitiesIntroductionClass 11

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