Question 138809
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It's possible to add them because they both have 
the same dimensions, {{{3x2}}}.

So just add their corresponding elements:

{{{(matrix(3,2,8,8,-3,3,4,3))+(matrix(3,2,3,-4,-7,-5,5,8)) = (matrix(3,2,(8)+(3),(8)+(-4),(-3)+(-7),(3)+(-5),(4)+(5),(3)+(8)))=(matrix(3,2,11,4,-10,-2,9,11))}}} 

That's it!

Edswin</pre>