Add answers with RREF for EV5 activity

[StevenClontz]

Adding the RREFs for this activity. I often find that it's helpful (when time is short) to skip reinforcing the RREF calculation skill with students and just show them the calculation. Putting it in the answers makes that convenient.

[StevenClontz]

Aside: I used sage code to export all the matrix calculations:

latex.matrix_delimiters('[', ']')
latex.matrix_column_alignment('c')

M = matrix([
    [5,3,0,-1],
    [-2,1,0,3],
    [4,5,1,3],
]).transpose()

print(latex(M) + "\\sim" + latex(M.rref()))

[github-actions]

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