Page 117 - TB_6B
P. 117
Activity 1 Functions
There is a gumball machine that vends 4 gumballs for
$1. Think about the relationship between dollars and
the number of gumballs.
Complete the following table.
Dollar(s), x 1 2 3 4
Number of 4
Gumballs, y
If dollars are represented by x, and the number of gumballs is represented by y,
the relationship between x and y can be written as y = 4x.
In y = 4x, once the value of x is set, the corresponding value of y is set as well.
The relationship in which one quantity depends uniquely on another quantity is
called a function.
For every value of x, there is exactly one value
for y. If there are two or more values of y,
y is not a function of x.
44
multiply x by 4 natural numbers
smaller than x
16 1, 2, 3
Function Not a function
106
There is a gumball machine that vends 4 gumballs for
$1. Think about the relationship between dollars and
the number of gumballs.
Complete the following table.
Dollar(s), x 1 2 3 4
Number of 4
Gumballs, y
If dollars are represented by x, and the number of gumballs is represented by y,
the relationship between x and y can be written as y = 4x.
In y = 4x, once the value of x is set, the corresponding value of y is set as well.
The relationship in which one quantity depends uniquely on another quantity is
called a function.
For every value of x, there is exactly one value
for y. If there are two or more values of y,
y is not a function of x.
44
multiply x by 4 natural numbers
smaller than x
16 1, 2, 3
Function Not a function
106
