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What is the boundary value in the inequality (3x+7\leq x+19)?

Answer and explanation

Correct answer: (6)

The direct answer is option A, 6. A boundary value is obtained where the two sides become equal. Replace the inequality by equality: 3x+7=x+19. Subtract x from both sides: 2x+7=19. Subtract 7: 2x=12. Divide by 2: x=6. Thus the boundary value is 6. Option B, 7, is not produced by the algebra. Option C, 8, is also incorrect; substituting it gives unequal sides, 31 and 27. Option D, 5, likewise gives unequal sides, 22 and 24. For the original inequality, solving gives 3x+7\leq x+19, so 2x\leq12 and x\leq6; the boundary is still 6. Memory cue: for a linear inequality, first use equality to locate the boundary, then test the sign.

Related tags

Linear InequalitiesIntroductionClass 11

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