Intro Matrix

How many columns are in a 5 x 4 matrix?

• 5

• 4

• 20

• 9

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

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

• 8

• 9.01

• 6

• 1

Find B-A

• -3     1
  7     -1

• 1     0
  1     -4

• 4       0
  -6     0

• not possible because rows do not match columns

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

What is the name of each entry of a matrix?

• Row

• Element

• Dimension

• Rectangle

• 
• 
• 
• 

What is 3A?

• 
• 
• 
• 

Find the sum

• 
• 
• 
•