<PRE><B>Question 700859</B>
&lt;br&gt;&lt;font face=&quot;Tahoma&quot;&gt;The equation of a horizontal line is always:&lt;br&gt;

{{{y=c}}} where c is some constant.&lt;br&gt;

Notice there is no x to be found.&lt;br&gt;

So in this case, our horizontal line goes through the point (4,-6).&lt;br&gt;

This means that our &quot;c&quot; is simply -6,&lt;br&gt;

as that is the y-coordinate of our given point.&lt;br&gt;

The line also goes through (3,-6), (2,-6) and even (-548,-6),&lt;br&gt;

and an infinite number of other points.&lt;br&gt;

The equation for this particular horizontal line is:&lt;br&gt;

{{{y=-6}}}&lt;br&gt;

And you probably know this by now, but&lt;br&gt;

the vertical line going through the same point (4,-6) is simply:&lt;br&gt;

{{{x=4}}}&lt;br&gt;

I hope this helps!  Keep practicing!  :)&lt;br&gt;

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