Matrix Review

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

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.

Add

• 11    8
  -4     2
• 3     2
  -6    -6
• -3    2
  -4    -6
• 10    8
  -6    2

Add.

• -2   4   -9
  -1   -6   -17
• -8   12   -9
  1   6   17
• -8   4   -9
  15   6   7
• -2   -4   -9
  15   6    7

Add.

• No Sum Exists

• 
• 
• 

Subtract

• -5
  -8
  3
  10
• -9
  8
  3
  2
• 5
  -8
  3
  10
• -5
  8
  3
  2

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

• 8
• 9.01
• 6
• 1

What is the value of element a₂₃?

• 2
• -1
• 6
• 1

In Matrix R (pictured) what is the value of element R_3,2

• 8
• 9.01
• 6
• 1

The dimensions of a matrix is written as

• number of rows x number of columns

• number of columns x number of rows

• a multiple

• a number