<PRE><B>Question 125392</B>
Find the slope of the line passing through the points:

(4, 7) and (4, 5).&lt;br&gt;&lt;br&gt;

The formula for this is:
{{{s=(y2-y1)/(x2-x1)}}}&lt;br&gt;&lt;br&gt;

So, plug in your values to get:
{{{s=(5-7)/(4-4)}}}&lt;br&gt;&lt;br&gt;

Subtract:
{{{s=-2/0}}}&lt;br&gt;&lt;br&gt;

But wait! You can&#39;t divide by zero! When you run into a problem like this where the denominator turns out to be zero, the slope is indefinite, because the line goes straight up. So, the answer is indefinite.&lt;br&gt;&lt;br&gt;

-buildings</PRE>