Question 195835
<pre><font size = 4 color = "indigo"><b>
Plot some points.  Make a chart like this

x | y
-----
  |
  |
  |

Now since the equation is y = -1, the only
choice we can give for y is -1, so we put
-1's for all the y's

x | y
-----
  |-1
  |-1
  |-1

The equation y = -1 contains no x's, so we
can pick any three numbers at random for
the x's.  Say we pick -3, 0, and 4

x | y
-----
-3|-1
 0|-1
 4|-1

Plot those three points

{{{drawing(400,400,-5,5,-5,5, graph(400,400,-5,5,-5,5),

line(-3.1,-1,-2.9,-1), line(-3,-.9,-3,-1.1),
line(-0.1,-1,0.1,-1), line(0,-.9,0,-1.1),
line(4.1,-1,3.9,-1), line(4,-.9,4,-1.1)  )}}}

Draw a straight line through them:

{{{drawing(400,400,-5,5,-5,5, graph(400,400,-5,5,-5,5,-1),

line(-3.1,-1,-2.9,-1), line(-3,-.9,-3,-1.1),
line(-0.1,-1,0.1,-1), line(0,-.9,0,-1.1),
line(4.1,-1,3.9,-1), line(4,-.9,4,-1.1)  )}}}

So you see it is a horizontal line through -1 on the
y-axis.  

Edwin</pre>