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31 May, 07:59

If the sum of a number and nine is doubled , the result is eight less than the number. Find the number.

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Answers (2)
  1. 31 May, 08:48
    0
    Equation

    Let the number = x

    2 * (x + 9) = x - 8

    Solve

    2 (x + 9) = x - 8 Remove the brackets on the left

    2x + 18 = x - 8 Subtract x from both sides

    2x - x + 18 = - 8 2x and - x will combine

    x + 18 = - 8 Subtract 18 from both sides

    x = - 8 - 18

    x = - 26

    Check

    LHS

    2 (-26 + 9)

    2 (-17)

    -34

    RHS

    x - 8

    -26 - 8

    - 34 and the RHS = LHS and they check
  2. 31 May, 10:42
    0
    Your number would be - 26

    Sorry if this is wrong but I'm pretty sure its right
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