A matrix is a rectangular array of numbers in rows and columns. They can be very useful in data representation, and for representing equations that need to be solved. While it is not an objective of this assignment, you will eventually learn that your calculator can make use of matrices to solve systems of equations.
Under certain conditions, matrices can be added, subtracted, and multiplied. In other words, you can apply number operations to matrices. These operations, of course, have to be clearly defined.
Note the MATRIX is a button on your TI-83 graphics calculator. We will learn how to do some basic calculator operations with matrices. In the TI-83 Graphing Calculator Guidebook, you can read about matrix operations beginning in section 10.1.
Due to the limitations of available symbolism here, the demonstrations below will be with matrices having just one row.