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Re: Which of the following is equivalent to the pair of [#permalink]

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Re: Which of the following is equivalent to the pair of [#permalink]

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02 Aug 2016, 07:05

Top Contributor

Walkabout wrote:

Which of the following is equivalent to the pair of inequalities x + 6 > 10 and x - 3 < 5 ?

(A) 2 < x < 16 (B) 2 < x < 4 (C) 2 < x < 8 (D) 4 < x < 8 (E) 4 < x < 16

The above solutions are great. I just want to add one more tip. When it comes to multiple inequalities, I find that it helps to rearrange them so that the inequality signs are all facing the same direction (I prefer arranging them so that the values are in ascending order from left to right)

So, x + 6 > 10 and x - 3 < 5 first become 10 < x + 6 and x - 3 < 5 For 10 < x + 6, we subtract 6 from both sides to get: 4 < x For x - 3 < 5, we add 3 to both sides to get: x < 8 With the two inequality signs facing the same direction, it's easy to combine them to get 4 < x < 8

Re: Which of the following is equivalent to the pair of [#permalink]

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28 Aug 2017, 13:33

Top Contributor

Walkabout wrote:

Which of the following is equivalent to the pair of inequalities x + 6 > 10 and x - 3 ≤ 5 ?

(A) 2 < x < 16 (B) 2 ≤ x < 4 (C) 2 < x ≤ 8 (D) 4 < x ≤ 8 (E) 4 ≤ x ≤ 16

Another approach is to eliminate 4 of the answer choices

First, x + 6 > 10 can be rewritten as x > 4 This means that x CANNOT equal 3 When we check the answer choices, we see that A, B and C all say that x COULD equal 3 So, eliminate A, B and C

Second, x - 3 ≤ 5 can be rewritten as x ≤ 8 This means that x CANNOT equal 9 When we check the remaining answer choices, we see that E says that x COULD equal 9 So, eliminate E

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