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Resultant vector help!

  1. Aug 29, 2011 #1
    1. The problem statement, all variables and given/known data

    Points: 3)
    A vector X is added to vector Y = 12i -16j. The resultant vector lies along the positive x axis and has the same magnitude as X. What is the magnitude of X?

    a. 20.7

    b. 16.7

    c. 11.3

    d. 4.7
  2. jcsd
  3. Aug 29, 2011 #2
    What have you done so far to work this out? What are you stuck on?
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