Matrices Elements and Dimensions and Types

You can multiply a 2X3 matrix by which matrix?

• 2X2

• 2X12

• 3X12

• 2X3

Find B-A

• -3     1
  7     -1

• 1     0
  1     -4

• 4       0
  -6     1

• not possible because rows do not match columns

What is the value of element a₂₃?

• 2

• -1

• 6

• 1

What is matrix addition?

• Multiplying the corresponding elements of two matrices together.

• Subtracting the corresponding elements of two matrices.

• Dividing the corresponding elements of two matrices.

• Adding the corresponding elements of two matrices together.

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 are the dimensions of this matrix?

• 2 x 3

• 3 x 2

• 6 x 1

• 1 x 6

Dimensions?

• a

• b

• c

• d

The size of the matrix is

• 2 x 3

• 3 x 2

What type of matrix is this?

• Column Matrix

• Row Matrix

• Square Matrix

• Zero Matrix

How many rows are in a 7 x 3 matrix?

• 7

• 3

• 21

• 10