Answer:
Associative property
Explanation:
Given: addition of matrices
To find: property shown in the matrix addition
Solution:
A matrix is a rectangular array in which elements are arranged in rows and columns.
Let A, B be the matrices and
(zero matrix) denotes identity for addition
Inverse Property states that
such that A and B are inverse of each other.

Identity property states that

Commutative property states that

Associative property states that

The matrix addition given in the question shows Associative property.