Question 42604
<pre><font size = 3><b>
what do points on the line parallel to the y-axis in 3 units to the left of it
have in common?with a summary.

Draw the line. Then mark some point arbitrarily and compare their coordinates
to see what they have in common.

 {{{ graph( 400, 400, -10, 10, -10, 10, 9999(x+3), 3+sqrt(.05-(x+3)^2), 3-sqrt(.05-(x+3)^2), 7+sqrt(.05-(x+3)^2), 7-sqrt(.05-(x+3)^2), -8+sqrt(.05-(x+3)^2), -8-sqrt(.05-(x+3)^2), -4+sqrt(.05-(x+3)^2), -4-sqrt(.05-(x+3)^2), sqrt(.05-(x+3)^2),
 -sqrt(.05-(x+3)^2) )  }}}

I have marked some points arbitrarily on that line.  The top one is (-3,7), the
next one down is (-3,3), the bottom one is (-3,-8).  Notice that they all have
the same x-coodinate, namely -3.

That's the answer.  All the points on that line have in common the fact that
their x-coordinates are -3.  

Edwin
AnlytcPhil@aol.com</pre>