True or False?

When working with a function, substituting a certain value of $x$x into the formula gives only one value of $y$y for that value of $x$x.

True

False

What is the name used to describe a graph where for some value of $x$x, there exists two or more different values of $y$y?

A horizontal line can intersect the graph of a function at more than one point.

Consider the following statement:

All relations are functions.