Question 208503
<pre><font size = 5 color = "indigo"><b>
The point (u,v) rotated 90° counter-clockwise
about the origin becomes the point (-v,u)

{{{drawing(400,400,-6,6,-6,6,
locate(3,1,"B(3,1)"), locate(-3,4.5,"A(-3,4)"), locate(-2.5,-5,"C(-1,-5)"),
graph(400,400,-6,6,-6,6),  

blue(triangle(3,1,-3,4,-1,-5)) )}}}  {{{drawing(400,400,-6,6,-6,6,
locate(-2.5,3.5,"B(-1,3)"), locate(-4,-3,"A(-4,-3)"), locate(4,-1.5,"C(5,-1)"),
graph(400,400,-6,6,-6,6),  

red(triangle(-1,3,-4,-3,5,-1)) )}}}

The correct answer is choice D)

Edwin</pre>