Identify Dimensions and Add Matrices CW

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

How is the entry of a matrix identified?

• Row x Column

• Column x Row

• Row only

• Column only

Dimensions?

• a
• b
• c
• d

What are the dimensions of this matrix?

• 3x1
• 1x3
• 3x3
• 1x1

How many rows are in a 7 x 3 matrix?

• 7
• 3
• 21
• 10

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

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

• 8
• 9.01
• 6
• 1

What comes first in the order?

• Row
• Column

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

Add

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