6 1 relations lesson
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6-1 Relations
6-1 Relations 6-1 Relations
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A relation is an operation, or series of operations, that maps
one number onto another.
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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
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You can think of a relation as a machine that uses numbers to
produce other numbers.
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This machine adds 5 to any number you put into it.
5x
17
22
11
6
0
5
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What relation does this machine What relation does this machine represent?represent?
?
2
4
7
14
21
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One possibility is that each number One possibility is that each number is multiplied by –2.is multiplied by –2.
x2
2
4
7
14
21
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Example 1
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