Question

Use the vertical- line Test to determine which graph represents a function? I'm thinking it's the first one...

Answer 1

its gonna be the 2nd one...the one  horizontal line.
The reason is a function is not gonna have any repeating x values...they can have repeating y values, just not the x ones. All the other graphs have repeating x values...so they are not functions

Answer 2

Using the vertical line test, the graph that represents a function is graph (b)

For a graph to represent a function, the graph must pass the vertical line test.

The vertical line test is such that:

The line from the x-axis passes through a corresponding y-value just once.

Graphs (a), (c) and (e) do not represent a function, because they do not pass the vertical line test

Hence, the graph that represents a function is graph (b)

Read more about vertical line test at:

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