What is the size of the matrix below? Always do Rows x Columns.

• 3 x 4

• 4 x 3

What is the size of the matrix below?

• 0 x 1

• 1 x 0

• 3 x 3

• 3 x 0

Which element is located in A₂₃?

• -3

• 5

• -9

• 2

Subtract

• 3    -8
  0   -1

• 3   -4
  8  -13

• -3   8
  0    1

• 3   -8
  -8    1

Find A-B

• -3     1
  7     -1

• 1     0
  1     -4

• -4       0
  6     -1

• not possible because rows do not match columns

Add

• 11    8
  -4     2

• 3     2
  -6    -6

• -3    2
  -4    -6

• 10    8
  -6    2

Multiply

• 20     15    -10
  30     -5         0

• -20      15     -10
  30     -5          0

• 1        8       3
  11     4        5

• 20     -15     10
  -30         5        0  

What is the location of 5?

• A₁₂

• A₂₁

• A₂₅

• A₁₃

Match each matrix to its correct dimension.

• 4 x 2

• 
• 1 x 3

• 
• 3 x 1

• 
• 2 x 3

• 
• 2 x 4

• 

What must be true in order to ADD two matrices?

• They must be square.

• The dimensions must be equal.

• The determinant can't equal 0.

• The column of the 1st must equal the row of the 2nd.