To solve the system of simultaneous equations using the Casio fx-991ES PLUS, follow these steps:
Steps for Solving Simultaneous Equations
1. Enter Mode for Equation Solving:
o Press the MODE button.
o Select EQN by pressing the corresponding number.
2. Select the Number of Unknowns:
o Choose 2 (for 3 variables).
3. Input Coefficients:
o Enter the coefficients of the equations as prompted by the calculator.
4. View the Results:
o After entering all the coefficients, the calculator will display the solutions for x, y, and z sequentially:
 x≈1.048
 y≈1.524
 z≈1.667