Basic Matrices

Multiply the above matrices.

• 
• 
• 
• 

Find the value of x, y and z.

• x = 9, y = -1, z = 4

• x = 3, y = -1, z = 7

• x = 3, y = -1, z = 1

• x = 2, y = -1, z = 7

What do m, n, p and q equal in this scalar matrix multiplication?

• m=8, n=9, p=-4, q=4 

• m=15, n = -45, p=20, q=-5

• m=20, n=-5, p=15, q=-45

• m=-5, n=20, p=-45, q=15

Add

• 11    8
  -4     2

• 3     2
  -6    -6

• -3    2
  -4    -6

• 10    8
  -6    2

Find A-B

• -3     1
  7     -1

• 1     0
  1     -4

• -4       0
  6     -1

• not possible because rows do not match columns

Can the operation be performed?

• Yes

• No

• Sometimes

• only Mrs. Jordan knows

Find B-A

• -3     1
  7     -1

• 1     0
  1     -4

• -4       0
  6     -1

• not possible because rows do not match columns

In Matrix R (pictured) what element is in the second row, third column?

• 8

• 9.01

• 6

• 1

The matrix A - B is

• 
• 
• 
• 

The number of elements in this matrix is

• 2

• 3

• 6

• 7