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September 30th, 2010, 07:27 PM  #1 
Newbie Joined: Sep 2010 Posts: 1 Thanks: 0  Intersection of two planes in R3
I thought I understood equations of planes in R3 and their intersections, but apparently not. I'm very confused by what seems to be a basic problem: find a vector equation for the line of intersection of x + y + z= 0 and x + z = 0. Is x + z= 0 still a plane even though it doesn't have the form Ax + By + Cz = D? I notice that if you set the two equations equal to each other you find that y = 1. Does this mean that the planes intersect on a line where y =1 and all x coordinates are equal to negative z coordinates? Thanks! 
October 2nd, 2010, 11:18 AM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Re: Intersection of two planes in R3 Hello, majami! Quote:
 

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