Let C=    and D=
[-4 -4]  [ 0 -2]
[ 0  2]  [ 5  7]
[ 4  5]  [-1  2]

Find C+D.

All you do is add the corresponding elements:

        [-4 -4]   [ 0 -2]   [-4+0 -4-2]   [-4 -6]
C + D = [ 0  2] + [ 5  7] = [ 0+5  2+7] = [ 5  9]
        [ 4  5]   [-1  2]   [ 4-1  5+2]   [ 3  7]

Edwin

Let A= [0]  B=[1 2 3]  C=[-3 7]
       [-4]   [0 5 2]    [ 9 8]
       [3]    [0  (answered by Edwin McCravy)

A=[ 5 0 -9       
   -5 6  2] 
  
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 x + 2y = 1

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a = [ 6  5]
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