Introduction to Matrices

What is a matrix?

• An equation of over 5 numbers or symbols

• A set of numbers in rows and columns

• A method of finding the n^th value of a series

• A complicated number system

What is the name of each number in a matrix?

• Row

• Entry

• Element

• Dimension

How many rows are in a 7 x 3 matrix?

• 7

• 21

• 3

• 10

Where is element 4 located in this matrix?

• ⁴₂₃

• 4₁₂

• 4₂₁

• 4₂₂

In Matrix R (pictured) what is the value of element R₃₂

• 8

• 6

• 9.01

• 3

What are the dimensions of this matrix?

• 2 x 3

• 1 x 6

• 3 x 2

• 6 x 1

Find the size of this matrix:

• 4 x 1

• 1 x 4

Find the size of this matrix:

• 5 x 2

• 2 x 5

For this matrix, which element is in row 2 column 3?

• -8

• 9

• 7

• -2

which of these is NOT a use of matrices?

• Matrix algebra makes mathematical expression and computation easier.

• It allows you to get rid of cumbersome geometry problems

• Mathematicians applied matrices to the study of systems of linear equations, where they are still very useful

• Matrices have also come to have important applications in computer graphics, where they have been used to represent rotations and other transformations of images.