Answer:
1. MNP-WXY
Explanation:
Line up each angle with the one that corresponds with it on the other triangle. (so M=W, N=X, P=Y)
Then, look at each equation and see it each one is in the right spot on each side. (So M and W should be in the same spot, N and X should be in the same spot, and P and Y should be in the same spot)
So the possible statements could be: MNP-WXY, NPM-XYW, PMN-YWX, PNM-YXW, MPN-WYX, and etc.
Sometimes, the triangles aren't lined up with each correct angle in the corresponding spot and to fix that, just flip the triangle.
(hope this helps...and makes sense :P)