Exercise 9 Page 204

To determine whether or not the polygons are congruent, let's first draw $△JKL$ and $△MNP$ using the given coordinates.

Now, we can check if they are congruent by using congruence transformations to map one triangle onto the other. Notice that vertex $K$ is $2$ units to the left of vertex $N.$ Let's translate $△JKL$ by $2$ units to the right, to see if we can map the figures onto each other.

Since vertices $N$ and $M$ are translated $2$ units right to $K$ and $L$ respectively, and $P$ is translated $1$ unit right to $J$, this is not a rigid motion. Therefore, $△JKL$ and $△MNP$ are not congruent.