<PRE><B>Question 358884</B>
The easiest way to tell if the graph of a relation is a function is to use the vertical line test! &lt;br&gt;

If you draw a vertical line through any (and all) points on the graph, and the vertical line touches 2 or more points on the graph, then it is NOT a function!&lt;br&gt;

Remember functions have a 1 to 1 relationship.&lt;br&gt;

For each x value, there is 1 and only 1 y value.&lt;br&gt;

So if any x value has 2 or more y values, it can NOT be a function.&lt;br&gt;

The vertical line test will show this to you graphically.&lt;br&gt;

If you draw a vertical line through any (and all) points on the graph, and the vertical line touches only 1 point on the graph, then it is a function!&lt;br&gt;

I hope this helps!&lt;br&gt;</PRE>