92.131
Lecture 3A
1 of 22
Ronald Brent © 2010 All rights reserved.
x
y
−4
−2
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Functions
Definition:
A
function
f
, defined from a set
A
to a set
B
, is a rule that associates with each
element of the set
A
one, and only one, element of the set
B
.
Examples:
a)
Graphs:
b)
Tables:
c)
Words:
The cost of a taxicab is $2.00 for the first 1/4 of a mile and $1.00 for each
additional 1/8 of a mile.
d)
Symbols:
2
)
(
2
+
=
x
x
f
x
y
0
50
10
57.50
20
65
30
80
40
95
50
125
60
200

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