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In this table, is it possible that $y$ is a function of $x\text{?}$

$x$

$y$

$5$

$8$

$5$

$10$

$5$

$-8$

$5$

$0$

y is a function of x
y is not a function of x

In this table, is it possible that $y$ is a function of $x\text{?}$

$x$

$y$

$8$

$5$

$10$

$5$

$-8$

$5$

$0$

$5$

y is a function of x
y is not a function of x

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