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CASIO

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Equation Calculations (EQN)

Simultaneous Equations

Simultaneous Linear Equations with Two Unknowns:

a1x + b1y = c1
a2x + b2y = c2

Simultaneous Linear Equations with Three Unknowns:

a1x + b1y + c1z = d1
a2x + b2y + c2z = d2
a3x + b3y + c3z = d3

Entering the EQN Mode displays the initial simultaneous equation screen.

Use this screen to specify 2 or 3 as the number of unknowns, and input values for each of the coefficients.

(1) Coefficient name
(2) Element value
(3) Arrow indicates direction you should scroll to view other elements.

Any time until you input a value for the final coefficient (c2 for two unknowns, d3 for three unknowns), you can use the and keys to move between coefficients on the screen and make changes, if you want.

Note that you cannot input complex numbers for coefficients.

Calculation starts and one of the solutions appears as soon as you input a value for the final coefficient.

(1) Variable name
(2) Solution
(3) Arrow indicates direction you should scroll to view other solutions.

Press the key to view other solutions. Use and to scroll between all of the solutions for the equation.

Pressing the key at this point returns to the coefficient input screen.


Example: To solve the following simultaneous equations
2x + 3y - z = 15
3x - 2y + 2z = 4
5x + 3y - 4z = 9 (x = 2, y = 5, z = 4)

(Unknowns?) 3
(a1?) …. (d1?) 2 3 1 15
(a2?) …. (d2?) 3 2 2 4
(a3?) …. (d3?) 5 3 4 9
(x = 2)
(y = 5)
(z = 4)
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