Definition of a Function
Which of the following tables represent valid functions?
x
\displaystyle {x}
x
1
8
8
y
\displaystyle {y}
y
4
9
12
x
\displaystyle {x}
x
1
8
14
y
\displaystyle {y}
y
4
9
12
x
\displaystyle {x}
x
1
8
14
y
\displaystyle {y}
y
4
9
9
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