### Home > AC > Chapter 11 > Lesson 11.1.4 > Problem11-45

11-45.

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

• There is more than one output value for some inputs; therefore, the relation is not a function.

1. $x$

$y$

$−3$

$19$

$5$

$19$

$19$

$0$

$0$

$−3$

• It is a function. Every input had only one output even if it is the same output such as $19$.

1.  $x$ $y$ $7$ $-2$ $0$ $7$ $4$ $10$ $0$ $10$ $3$ $0$
• There is more than one output value for $x=7$.
Is this relation a function?

• It is a function.