Addition and subtraction of matrices
Activity 2.1.5
Cate was given three matrices A, Band Cwritten on the number.
below. cards as
A B C
/9 1
4 2 9) 13 6
3 7
7 53 |2 5 0 8
1. Write the order of the matrices on
each card.
2. Which of the cards have matrices of the
same order?
3. Which matrices can be added or
subtracted?
4. Discuss how to carry out addition and
subtraction of the matrices you identi
Learning points
" When two or more matrices are
compatible for addition or subtraction, we can a
subtract the elements in the corresponding
The resultant matrix after adding or positions.
subtracting matrices is of the same order ast
original matrices.
Example 6
1. Work out:
a) (1 1 1]. (3 2 8) 2 4)
(3 2.)
b) 7 -1-5 5
2 2 34 7
6 8 3 1
Solution
a) (1 111.(3 2 8
ldentify the element in corresponding
positions in the matrices and add them.
(1+3. 1+2 1+8)