What you want to do here is relatively straightforward - you see that -6 is in the top left of the left matrix, and -5 is in the top left of the right matrix. In the resultant matrix, in the top left corner, you have (-6-(-5))=-6+5=-1 for your answer. Showing it visually, we have
[tex] \left[\begin{array}{ccc}-6&-4\\6&0\\6&4\end{array}\right] - \left[\begin{array}{ccc}-5&5\\-4&-1\\6&-4\end{array}\right] = \left[\begin{array}{ccc}6-(-5)&-4-5\\6-(-4)&0-(-1)\\6-6&4-(-4)\end{array}\right] [/tex][tex]= \left[\begin{array}{ccc}-1&-9\\10&1\\0&8\end{array}\right][/tex]
Feel free to ask further questions!
