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Homework Help: What value will make these two vectors parallel?

  1. Oct 10, 2012 #1
    1. The problem statement, all variables and given/known data

    What value of c will make these two vectors parallel?

    2. Relevant equations

    3i + 2j + 9k = w
    5i - j + ck = v

    3. The attempt at a solution

    I tried too find a common factor to multiply by the w vector to get the components of the v vector, but no luck.

    3i (5/3) + 2j (5/3) +9k (5/3) = 5i + 10/3 j + 45/3 k ≠ 5i - j +ck
  2. jcsd
  3. Oct 10, 2012 #2


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    Would that lead you to conclude that there is no value of c that will make them parallel? Because that would be correct.
  4. Oct 10, 2012 #3
    I thought and thought about this problem, wondering if this is a trick question. It probably is that simple :).
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