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$x$

$3.5$

$2.0$

$2.5$

$3.5$

$2.5$

$4.0$

$2.5$

$3.0$

$y$

$2.5$

$3.0$

$2.5$

$4.0$

$3.5$

$4.0$

$2.0$

$2.5$

Is $y$ a function of $x\text{?}$
Each value of $x$ has exactly one value of $y$ associated with it.
For example, $x=3.5$ corresponds both to $y=2.5$ and also to $y=4.0$

$x$

$-3$

$-2$

$-1$

$0$

$1$

$2$

$3$

$y$

$17$

$3$

$0$

$-1$

$0$

$3$

$17$

Is $y$ a function of $x\text{?}$
Each value of $x$ has exactly one value of $y$ associated with it.
For example, $y=3$ corresponds both to $x=-2$ and also to $x=2$

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