Question

Find the sum or difference of the matrices.

Answer 1

Please help & walk me through it. I still don't understand the concept.

Answer 2

Just add across to get your answer

Answer 3

Also you could use this site http://www.mathsisfun.com/algebra/matrix-calculator.html

Answer 4

Read this and most likely you will start to understand.
http://www.purplemath.com/modules/mtrxadd.htm

Answer 5

\[
\left[\begin{array}{c c}-3&0\\5&-7\end{array}\right] +
\left[\begin{array}{c c}-4&2\\-1&8\end{array}\right] =
\left[\begin{array}{c c}-3+-4&0+2\\5+-1&-7+8\end{array}\right] =
\left[\begin{array}{c c}-7&2\\4&1\end{array}\right]
\]

Answer 6

\[
\left[\begin{array}{c c}-3&0\\5&-7\end{array}\right] -
\left[\begin{array}{c c}-4&2\\-1&8\end{array}\right] =
\left[\begin{array}{c c}-3--4&0-2\\5--1&-7-8\end{array}\right] =
\left[\begin{array}{c c}1&-2\\6&-15\end{array}\right]
\]