Casio fx-570MS - Manual (Page 21)

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Example 1 Example 1
Explanation Explanation
Operation
A group of 13 weights, some weighing 50 grams and some
weighing 20 grams, weigh a combined total of 530 grams.
How many of each type of weight are there?
If the number of 50g weights is x and the number of 20g
weights is y , the relation
x + y = 13
50 x + 20 y = 530
{ }
can be
established and solved as simultaneous equations.
*The following shows operation using the fx-100MS/115MS/570MS/991MS.
1 .
Select the EQN Mode and then specify the number of unknowns.
In this example we have two unknowns, x and y , so we would specify 2.
F F F 1
(Unknowns?)
2
2 .
Input the values for the coefficients of the linear equations with two unknowns
a
1
x + b
1
y = c
1
a
2
x + b
2
y = c
2
{ }
.
(a1?) 1
=
(b1?) 1 =
(c1?) 13
=
(a2?) 50 =
(b2?) 20 =
(c2?) 530 =
3 .
One of the solutions obtained appears on the display.
50
g
20
g
530
g
?
? ? ?
? ? ? ?
? ? ? ? ?
Solving Simultaneous Equations
(fx-95MS/fx-100MS/fx-115MS/fx-570MS/fx-991MS only)