<PRE><B>Question 357579</B>
Any linear equation with an undefined slope MUST be a vertical line. &lt;br&gt;

The vertical line is an equation in the form {{{x=c}}} where c is some number.&lt;br&gt;

Since we know it goes through the point (-8,1), we know that the x value is -8.&lt;br&gt;

This is true for any point that this line passes through.&lt;br&gt;

&lt;b&gt;Thus, the equation for this line is&lt;br&gt;

{{{x=-8}}}&lt;/b&gt;&lt;br&gt;

Notice that there is no y variable or slope in this equation, since the usual slope-intercept for is&lt;br&gt;

{{{y=mx+b}}} where m is the slope, and b is the y-intercept.&lt;br&gt;

As far as linear equations go, vertical lines (such as the one in this problem) are the only exception to the traditional slope-intercept form.&lt;br&gt;

I hope this helps! &lt;br&gt;</PRE>