Casio fx-115ES PLUS User Manual download pdf (Page 37)

E-36

• A message appears to let you know when there is no solution or when

there are infinite solutions. Pressing A or = will return to the Coefficient

Editor.

Changing the Current Equation Type Setting

Press N5(EQN) and then select an equation type from the menu that

appears. Changing the equation type causes the values of all Coefficient

Editor coefficients to change to zero.

EQN Mode Calculation Examples

x + 2y = 3, 2x + 3y = 4

N5(EQN)1(a

X + b

Y = c

)

1 = 2 = 3 =

2 = 3 = 4 =

(X=) –1

c (Y=) 2

x – y + z = 2, x + y – z = 0, –x + y + z = 4

N5(EQN)2(a

X + b

Y + c

Z = d

)

1 =- 1 = 1 = 2 =

1 = 1 =- 1 =0 =

- 1 = 1 = 1 = 4 =

(X=) 1

c (Y=) 2

c (Z=) 3

– 3x – 6 = 0 B

N5(EQN)3(aX

+ bX + c = 0)

2 =- 3 =- 6 ==

3 + 57

c (X

3 – 57

c (X-Value Minimum=)*

c (Y-Value Minimum=)*

–

* The local minimum value is displayed when a  0. The local maximum value

is displayed when

a  0.

–

x + 2 = 0 B

N5(EQN)3(aX

+ bX + c = 0)

1 =- 2 ! 2 )= 2 ==

(X=)

MathMath

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Casio fx-115ES PLUS User Manual Page 37

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