Question 982584
That looks like one single matrix 2x4.


This will make your two matrices look right:
(matrix(2,2,-1,0,6,2))-(matrix(2,2,-1,6,3,1))


{{{(matrix(2,2,-1,0,6,2))-(matrix(2,2,-1,6,3,1))}}}


Subtract corresponding elements.
{{{(matrix(2,2,0,-6,3,1))}}}