Question 1203418
<pre><font size=6><b>
Although Ikleyn is correct that using slopes is the quickest 
way to show that points are collinear, it is <u>ABSOLUTELY WRONG</u>  
to do this problem using slopes, because of the words

            "solve by addition of line segments"

are clearly stated in the instructions.  Following directions
is absolutely necessary.  

When I taught this I always taught both methods for instructional
purposes. 

Edwin</font></pre>