2. A relation is an operation, or
series of operations, that maps
one number onto another.
6-1 Relations6-1 Relations
3. RelationsRelations
Relation: a set of ordered pairs.
{(3, 2), (–1, 5), (0, 2)}
Domain: all of the first coordinates of a relation (think
of the domain as the inputs).
3, –1, 0
Range: all of the 2nd coordinates of a relation (think of
the range as the outputs).
2, 5, 2
6-1 Relations6-1 Relations
4. You can think of a relation as a
machine that uses numbers to
produce other numbers.
6-1 Relations6-1 Relations
5. This machine adds 5 to any
number you put into it.
5+x
17
22
11−
6−
0
56-1 Relations6-1 Relations
6. What relation does this machineWhat relation does this machine
represent?represent?
?
2−
4
7
14−
2
1
1−6-1 Relations6-1 Relations
7. One possibility is that each numberOne possibility is that each number
is multiplied by –2.is multiplied by –2.
x2−
2−
4
7
14−
2
1
1−6-1 Relations6-1 Relations
