On graph paper, graph quadrilateral $MNPQ$ if $M(-3,6)$, $N(2,8)$, $P(1,5)$, and $Q(- 4, 3)$.  

1. What shape is $MNPQ$? Show how you know.

   Hint (a):

   Look at the graph. Does the quadrilateral have any parallel sides? Does it have any congruent sides?

2. Use the function $(x, y) → (x, -y)$ to transform $MNPQ$ into $M'N'P'Q'$.
   What are the coordinates of $P$′? Describe the transformation.