Question 254354
<pre><font size = 4 color = "indigo"><b>

Let's draw a triangle in Quadrant III:

{{{drawing(400,400,-7,7,-7,7, graph(400,400,-7,7,-7,7),
locate(3,6, Quadrant I),locate(-5,6,QuadrantII), 
locate(-5,-6,QuadrantIII), locate(3,-6,QuadrantIV),
triangle(-3,-1,-5,-4,-2,-5)  )}}}

Now let's reflect that triangle in the y-axis.

Pretend that the y-axis is a mirror facing the triangle.

Then where would it look like the triangle's image would be?

It would be like this, right? 

{{{drawing(400,400,-7,7,-7,7, graph(400,400,-7,7,-7,7),
locate(3,6, Quadrant I),locate(-5,6,QuadrantII), 
locate(-5,-6,QuadrantIII), locate(3,-6,QuadrantIV),
triangle(-3,-1,-5,-4,-2,-5), triangle(3,-1,5,-4,2,-5)

  )}}}

That's Quadrant IV!

Edwin</pre>