Which relation does not represent a function? A) a vertical line B) y = 5 9 x - 3 C) a horizontal line D)

A) a vertical line.

Step-by-step explanation:

We use the vertical line test to determine whether a graph of a relation is a function or not.

The graph of a vertical line will not pass the vertical line test.

Hence a vertical line does not represent a function.

The graph of y=59x-3 will pass the vertical line test.

A horizontal line will also pass the vertical line test.