Adding/subtracting matrices

Chapter 14 Section 1- Adding and subtracting matrices.

Steps to adding and subtracting matrices:

1)A^t, to transpose : switch rows and columns.
2)In order to add matrices they have to have the same dimensions.(rows x columns)
3)In order to add matrices you must add corresponding entries.

Example 1. What are the dimensions of B?
[2 8]
[8 5]
[7 2]
[5 3]

Answer: 4 x 2

Example 2. Add D and B
D=[2 4] C= [ 2 10]
[16 1] [6 2]
[9 13] [1 3]

Answer: [4 14]
[22 3]
[10 16]