For the homework that is due tomorrow, when you have to compute the eigenvalues and eigenvectors of a system, you have two options: 1) Compute by hand and include your work on your paper homework, or
2) Compute using Sage and include the calculations in the Sage worksheet you will submit.
For problem 3.4/11, part (c), draw direction fields instead of phase portraits.
For problems that ask for direction field, it will be marked correct if you submit the vector field. For problems that ask for a phase portrait, do not draw the phase portrait.