I give up messing w/tex.
I used row reduction to simplify a system of equations to the following:
x_{1 }- x_{4} = 0
x_{2} + x_{4 }= 0
x_{3} - x_{4} = 0
Can someone explain to me the geometric interpretation of this? I know it maps from R^{4} to R^{3}. But is this a point scaled by x4 or a line? I need a bit of help understanding/visualizing the meaning. Thanks