Matrices Dimensions Elements

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

How many columns are in a 5 x 4 matrix?

• 5

• 4

• 20

• 9

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.

• a

• b

• c

• d

A (a)   describes the size of the matrix by the number of rows and columns.

• dimension

• entry

• array

• matrix

Which element is located in A₂₃?

• -3

• 5

• -9

• 2

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 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.

What is the value of the variable in the equation?

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