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Is it a function? (2)
供稿人: Williams
(原作者: Jarvie)
Relations
    and
Functions
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
Is this a function?

Cannot be determined
Yes
No
4
-4
8
-8
4
-4
8
-8
12
-12
Is this a function?
Cannot be
    determined
Yes
No
Is this a function?
Yes
No
Cannot be    determined
Is this a function?
Cannot be
    determined
Yes
No
Cannot be
    determined
Yes
No
Is this a function?
Function?
Yes
No
Cannot be
    determined
No
Cannot be determined
Yes
Is this a function?
When determining whether a relation is a
function, which coordinate cannot repeat?
x-coordinate
y-coordinate
x- and y-coordinates
Remember:  a relation is a set of ordered pairs.
Is this relation a function?
{(1, 4), (-5, 2), (4, 1), (1, 6)}
Yes
No, because "1" repeats 
No, beause "4" repeats
Cannot be determined
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