Enter a system and interpret a unique calculator solution

The printed workflow opens apps, chooses [4:PlySmlt2], then [2: SIMULTANEOUS EQN SOLVER]. Choose 3 equations and 3 unknowns, then press graph for NEXT. Its configuration screen also shows AUTO, NORMAL, FLOAT and DEGREE selected; the essential dimensions for this system are 3 by 3. These are the source device’s labels and menu numbering.

Keep columns in the order $x,y,z$, then the right-hand constant. The displayed input is the augmented matrix below; enter every row, including all signs and constants. CLEAR deletes all entries in the matrix.

$\left[\begin{array}{ccc|c}1&1&1&6\\1&2&1&8\\2&1&1&7\end{array}\right].$

Press graph for SOLVE. The printed output is $x=1$, $y=2$, $z=3$. MAIN returns to the main menu; MODE returns to simultaneous-equation solver mode; F◀▶D converts fractions to decimals and vice versa. The screenshots also show LOAD on the entry screen and SYSM/STORE on the result screen. Verify the mathematical output: $1+2+3=6$, $1+2(2)+3=8$, $2(1)+2+3=7$.