HP 48gII Graphing Calculator Manuel d'utilisateur télécharger pdf (Page 355)

To start the process of forward elimination, we divide the first equation (E1) by

2, and store it in E1, and show the three equations again to produce:

Next, we replace the second equation E2 by (equation 2 – 3×equation 1, i.e.,

E1-3×E2), and the third by (equation 3 – 4×equation 1), to get

Next, divide the second equation by –8, to get

Next, replace the third equation, E3, with (equation 3 + 6×equation 2, i.e.,

E2+6×E3), to get

Notice that when we perform a linear combination of equations the calculator

modifies the result to an expression on the left-hand side of the equal sign, i.e.,

an expression = 0. Thus, the last set of equations is interpreted to be the

following equivalent set of equations:

X +2Y+3Z = 7,

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HP 48gII Graphing Calculator Manuel d'utilisateur Page 355