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11 February, 19:56

Is the equation 3+z = - 9 true false or open

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Answers (2)
  1. 11 February, 20:54
    0
    Subtract 3 from both sides

    (z = - 9 - 3)

    Simplify - 9 - 3 to - 12

    z = - 12

    3 + - 12 = - 9 so this is true.
  2. 11 February, 21:43
    0
    3+z = - 9 is open since you do not have a value for z
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