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1 August, 09:16

Is the inequality always, sometimes or never true?

9 (x+2) > 9 (x-3)

answer is 2>3 and i said it's never true, right?

2. 6x-13 < 6 (x-2)

answer is 6x-13 < 6x-12 my answer is sometimes

3. - 6 (2x-10) + 12x less than or equal to 180. im stuck.,

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Answers (1)
  1. 1 August, 09:40
    0
    In order to understand if the inequalities are always, never or sometimes true, you need to perform the calculations:

    A) 9 (x+2) > 9 (x-3)

    9x + 18 > 9x - 27

    the two 9x cancel out and you get:

    +18 > - 27

    which is always true.

    B) 6x-13 < 6 (x-2)

    6x - 13 < 6x - 12

    the two 6x cancel out and you get:

    - 13 < - 12

    which is always true

    C) - 6 (2x-10) + 12x ≤ 180

    -12x + 60 + 12x ≤ 180

    -12x and + 12x cancel out and you get:

    60 ≤ 180

    which is always true.

    All three cases are always true.
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