Adding and Subtracting Matrices

What is the name of each entry of a matrix?

• Row
• Element
• Dimension
• Rectangle

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

How many rows are in a 7 x 3 matrix?

• 7
• 3
• 21
• 10

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.

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

Find A+B

• 8     10
  8      1 
• 12     25
  7     1
• 10     30
  0     1
• can't add two together because the rows dont match columns

Subtract

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

Subtract

• 3    -8
  0   -1
• 3   -4
  8  -13
• -3   8
  0    1
• 3   -8
  -8    1

Given these matrices find D - A

• 
• 
• 
• NA

Given these matrices find C - D

• 
• 
• 
• NA