Casio FX-9750GII-SC User Guide - Page 103

Chapter 4 Equation Calculations From the Main Menu, enter the EQUA mode. • {SIML} ... {linear equation with 2 to 6 unknowns} • {POLY} ... {degree 2 to 6 equation} • {SOLV} ... {solve calculation} 1. Simultaneous Linear Equations You can solve simultaneous linear equations with two to six unknowns. • Simultaneous Linear Equation with Two Unknowns: a1x + b1y = c1 a2x + b2y = c2 • Simultaneous Linear Equation with Three Unknowns: a1x + b1y + c1z = d1 a2x + b2y + c2z = d2 a3x + b3y + c3z = d3 4 ... 1. From the Main Menu, enter the EQUA mode. 2. Select the SIML (Simultaneous) mode, and specify the number of unknowns (variables). You can specify from 2 to 6 unknowns. 3. Sequentially input the coefficients. • The cell that is currently selected for input is highlighted. Each time you input a coefficient, the highlighting shifts in the sequence: a1 m b1 m c1 m ... an m bn m cn m (n = 2 to 6) • You can also input fractions and values assigned to variables as coefficients. • You can cancel the value you are inputting for the current coefficient by pressing ) at any time before you press U to store the coefficient value. This returns to the coefficient to what it was before you input anything. You can then input another value if you want. • To change the value of a coefficient that you already stored by pressing U, move the cursor to the coefficient you want to edit. Next, input the value you want to change to. • Pressing (CLR) clears all coefficients to zero. 4. Solve the equations. Example To solve the following simultaneous linear equations for x, y, and z 4x + y - 2z = - 1 x + 6y + 3z = 1 - 5x + 4y + z = - 7 4-1