I am having difficulty understanding this question:
Graph the subspace spanned by the vectors $i = (3,-2,-1)^T$, $j = (-2,0,-1)^T$.
You don't have to graph it, but the answer for this problem is $z = (-3/5)x - (6/5)y$. I don't understand how to come up with that answer. I tried setting $i=-j$ but to no avail. Also, sorry for writing $i,j$ with $^T$, I do not know how to format it to make it look like a column vector.