Is
r
(
t
)
\displaystyle {r}{\left({t}\right)}
r
(
t
)
represented in the list of ordered pairs below a function?
r
(
t
)
=
{
(
3
,
5
)
,
(
4
,
4
)
,
(
5
,
−
2
)
,
(
6
,
3
)
,
(
7
,
−
2
)
,
(
8
,
−
4
)
}
\displaystyle {r}{\left({t}\right)}={\left\lbrace{\left({3},{5}\right)},{\left({4},{4}\right)},{\left({5},-{2}\right)},{\left({6},{3}\right)},{\left({7},-{2}\right)},{\left({8},-{4}\right)}\right\rbrace}
r
(
t
)
=
{
(
3
,
5
)
,
(
4
,
4
)
,
(
5
,
−
2
)
,
(
6
,
3
)
,
(
7
,
−
2
)
,
(
8
,
−
4
)
}
r
(
t
)
\displaystyle {r}{\left({t}\right)}
r
(
t
)
is a function
r
(
t
)
\displaystyle {r}{\left({t}\right)}
r
(
t
)
is not a function
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