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Chapter 10: Matrices 221
Chapter 10:
Chapter 10:Chapter 10:
Chapter 10:
Matrices
MatricesMatrices
Matrices
Getting Started: Systems of Linear Equations
Getting Started: Systems of Linear EquationsGetting Started: Systems of Linear Equations
Getting Started: Systems of Linear Equations
Getting Started is a fast-paced introduction. Read the chapter for details.
Find the solution of X + 2Y + 3Z = 3 and 2X + 3Y + 4Z = 3. On the TI-84 Plus, you can
solve a system of linear equations by entering the coefficients as elements in a matrix,
and then using
rref( to obtain the reduced row-echelon form.
1. Press y. Press ~~ to display the
MATRX EDIT menu. Press 1 to select 1: [A].
2. Press
2 Í 4 Í to define a 2×4 matrix. The
rectangular cursor indicates the current element.
Ellipses (
...) indicate additional columns beyond
the screen.
3. Press
1 Í to enter the first element. The
rectangular cursor moves to the second column of
the first row.