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Math Help - Help with lines of intersection

  1. #1
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    Help with lines of intersection

    Find the equation of the line of intersection of the two planes:
    x-y=3 and x +2y+3z=0

    I'm not sure if I'm doing this right.
    x=3+y
    3+3y+3z=0
    y=-z-1

    or do I take the cross product of <1,-1,0>X<1,2,3> with the point (0,0,-3)?

    Thanks in advance.
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  2. #2
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    Quote Originally Posted by khuezy View Post
    Find the equation of the line of intersection of the two planes:
    x-y=3 and x +2y+3z=0

    I'm not sure if I'm doing this right.
    x=3+y
    3+3y+3z=0
    y=-z-1

    or do I take the cross product of <1,-1,0>X<1,2,3> with the point (0,0,-3)?

    Thanks in advance.
    You do it like the one you were shown here: http://www.mathhelpforum.com/math-he...-equation.html

    That will give you the line of intersection in parametric form.
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