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Mathematics 17 Online
OpenStudy (jackellyn):

Compute the dimension of the intersection of the following two planes in R^3: x + 2y − z = 0, 3x − 3y + z = 0.

OpenStudy (fwizbang):

Eliminate the z coo0rdinates from the two equations x+2y-z = 0 -> 4x -y =0 which is the equation of a line -> the intersecction is 1-d 3x-3y +z =0

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