TI-83 PlusMatrices257
4.Press 2 Í 3 Í 3 Í to complete the
first row for X + 2Y + 3Z = 3.
5.Press 2 Í 3 Í 4 Í 3 Í to enter
the second row for 2X + 3Y + 4Z = 3.
6.Press y 5 to return to the home screen. If
necessary, press ‘ to clear the home
screen. Press y > ~ to display the
MATRX MATH menu. Press } to wrap to the end
of the menu. Select B:rref( to copy rref( to the
home screen.
7.Press y > 1 to select 1: [A] from the
MATRX NAMES menu. Press ¤ Í. The
reduced row-echelon form of the matrix is
displayed and stored in Ans.
1X N 1Z = L3 therefore X = L3 + Z
1Y + 2Z = 3 therefore Y = 3 N 2Z