Need to introduce solving equations with oo many solutions earier. Add
the notion of canonical solutions, independent family of solutions and
linear combinations of solutions. Maybe it will help come eigenvector
time.

Need to encourage students to write down the row operations. Need to
stop them from doing aimless row and fictious row operations.

Need to encourage students to possibility of expanding by columns
as well as by rows.

Need to encourage students to check answers.
* how many rows of zero's do I expect?

Need to decide if the twice a week format is better.