Intro to Matrices

What is a matrix?

• A matrix is a type of computer program.

• A matrix is a type of fabric used in clothing.

• A matrix is a type of food made from corn.

• A matrix is a rectangular array of numbers, symbols, or expressions arranged in rows and columns.

What is the order of a matrix?

(HINT: How are dimensions of a matrix written?)

• Number of elements

• Number of diagonals

• Number of rows and columns

• Number of columns and rows

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.

Tags

CCSS.HSN.VM.C.8

What is matrix multiplication?

• Multiplying the corresponding elements of two matrices together.

• Subtracting the corresponding elements of two matrices.

• Dividing the corresponding elements of two matrices.

• Multiplying the rows of the first matrix with the columns of the second matrix.

Tags

CCSS.HSN.VM.C.8

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

Tags

CCSS.HSN.VM.C.8

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.

Tags

CCSS.HSN.VM.C.8

Subtract

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

Tags

CCSS.HSN.VM.C.8

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

Tags

CCSS.HSN.VM.C.6

What is the value of the variable in the equation?

• 
• 
• 
• 

Tags

CCSS.HSN.VM.C.8

What is the name of each entry of a matrix?

• Row
• Element
• Dimension
• Rectangle