CPM Homework Help : CCA Problem 1-78

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1-78.

Which of the relationships below are functions? If a relationship is not a function, give a reason to support your conclusion.

Answer (a):
There is more than one output value for some inputs; therefore, the relation is not a function.

$x$
$y$
$-3$
$19$
$5$
$19$
$19$
$0$
$0$
$-3$

Answer (b):
It is a function. Every input had only one output even if it is the same output such as $19$ .

$x$
$7$
$-2$
$0$
$7$
$4$
$y$
$10$
$0$
$10$
$3$
$0$

Hint (c):
There is more than one output value for $x=7$ .
Is this relation a function?

Answer (d):
It is a function.

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