2. MATRIX: A rectangular arrangement of numbers in rows and columns. The ORDER of a matrix is the number of the rows and columns. The ENTRIES are the numbers in the matrix. rows columns This order of this matrix is a 2 x 3.

3. 3 x 3 3 x 5 2 x 2 4 x 1 1 x 4 (or square matrix) (Also called a row matrix) (or square matrix) (Also called a column matrix)

4. To add two matrices, they must have the same order. To add, you simply add corresponding entries.

5. = = 7745 075 7

6. To subtract two matrices, they must have the same order. You simply subtract corresponding entries.

7. = 5-2 -4-13-8 8-30-(-1)-7-1 1-(-4) 2-0 0-7 = 2-5 5 1 -8 53-7

8. In matrix algebra, a real number is often called a SCALAR. To multiply a matrix by a scalar, you multiply each entry in the matrix by that scalar.

9. -2 6 -33 -2(-3) -5 -2(6)-2(-5) -2(3)6-6 -12 10

10. The number of columns in the first matrix must equal the number of rows in the second matrix. The order of the product of matrices is the number of rows in the first matrix multiplied by the number of column in the second matrix. When multiplying, multiply the elements of a row of the first matrix by the elements in a column of the second matrix and add the products.

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