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14 April, 05:28

If 9a + 8b+9c=-9, what is 81c+72b+81a?

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Answers (2)
  1. 14 April, 06:01
    0
    Ok so given

    9a + 8b + 9c = - 9

    &

    81c + 72b + 81a

    now i rearrange the terms (since addition is commutative)

    81a + 72b + 81c

    what is this equal to?

    well comparing the first and 2nd equation

    9a + 8b + 9c = - 9

    81a + 72b + 81c = ?

    well compare 9a to 81a? is there something you can multiply to the first to get the 2nd

    compare 8b to 72b, can you use that same number to get 2nd

    same for 9c to 81c

    you would probably notice that by multiplying them all by 9, you will get the terms in the 2nd expression

    so, if you multiply each term in the first to get the 2nd, wouldnt the answer of the 2nd be the 1st multiplied by 9?
  2. 14 April, 07:44
    0
    9x9=81

    8x9=72

    9x9=81

    -9x9=-81
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