I give up messing w/tex.
I used row reduction to simplify a system of equations to the following:
x1 - x4 = 0
x2 + x4 = 0
x3 - x4 = 0
Can someone explain to me the geometric interpretation of this? I know it maps from R4 to R3. But is this a point scaled by x4 or a line? I need a bit of help understanding/visualizing the meaning. Thanks