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Explicit Description of a Plane

  1. Nov 10, 2012 #1
    I understand how to find an implicit description if given the span of, say, two vectors. How do I go about finding an explicit description of a plane as the span of two vectors? For example, where would I start if the plane equation was:

    3x+2y-z = 0

    Thanks!
     
  2. jcsd
  3. Nov 10, 2012 #2

    micromass

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    What do you mean with "explicit description"? What is it of the plane that you would like to know?
     
  4. Nov 10, 2012 #3
    i.e. Describe the plane as the span of a two-vector set.
     
  5. Nov 11, 2012 #4

    Erland

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    You can only do that if the plane passes through the origin. Otherwise, it is such a span plus some constant vector.

    But in your example, the plane passes through the origin, and the simplest way to find two vectors spanning the plane is to solve for one variable and put the others as parameters, say:
    z=3x+2y, which leads to

    ##x=s##, ##y=t##, ##z=3s+2t##, or

    ##[x\,\, y\,\, z]^T=[s\,\, t\,\, 3s+2t]^T=s[1\, \,0\,\, 3]^T+t[0\,\,1\,\,2]^T##.
     
  6. Nov 11, 2012 #5
    Okay, that is what I was thinking, but wasn't positive.

    Thank you
     
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