Select all the relations which are
not
functions.
{
(
x
,
y
)
∣
x
\displaystyle {\left\lbrace{\left({x},{y}\right)}{\mid}{x}\right.}
{
(
x
,
y
)
∣
x
is a randomly selected natural number greater than 9 and
y
\displaystyle {y}
y
is the remainder when that number is divided by 9
}
\displaystyle {\rbrace}
}
{
(
x
,
y
)
∣
x
\displaystyle {\left\lbrace{\left({x},{y}\right)}{\mid}{x}\right.}
{
(
x
,
y
)
∣
x
is the color of a traffic light and
y
\displaystyle {y}
y
is the lawful response of an approaching motorist to that light
}
\displaystyle {\rbrace}
}
{
(
x
,
y
)
∣
x
\displaystyle {\left\lbrace{\left({x},{y}\right)}{\mid}{x}\right.}
{
(
x
,
y
)
∣
x
is an amount of alcohol consumed and
y
\displaystyle {y}
y
is the blood alchohol concentration for a person consuming that amount of alcohol
}
\displaystyle {\rbrace}
}
{
(
x
,
y
)
∣
x
\displaystyle {\left\lbrace{\left({x},{y}\right)}{\mid}{x}\right.}
{
(
x
,
y
)
∣
x
is the time of day and
y
\displaystyle {y}
y
is the maximum officially recorded temperature at the nearest airport for that day
}
\displaystyle {\rbrace}
}
{
(
x
,
y
)
∣
x
\displaystyle {\left\lbrace{\left({x},{y}\right)}{\mid}{x}\right.}
{
(
x
,
y
)
∣
x
is the water level (height in inches) in a cylindrical tank that is filled with 35 gallons of water and
y
\displaystyle {y}
y
is the diameter (in inches) of the tank
}
\displaystyle {\rbrace}
}
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