Question

△LMN is the result of a reflection of △XYZ ​ across the y-axis.

Answer 1

The answer is N because LMN is a reflection of XYZ so therefore z corresponds with n 

Answer 2

We have been given that $\bigtriangleup LMN$ is reflection image of $\bigtriangleup XYZ$ across the y-axis and we have to find which angle from the given image corresponds to $\angle Z$ .

We know that a refection gives us mirror image of the point or object we are reflecting and line of reflection which in our case is y-axis acts as a mirror. Line of reflection  is equidistant from object or point and its image.

Now let us look at our given image. After looking at our image we see that y-axis is halfway between X and L,Y and M and also Z and N.

We can see that $\angle Z$ corresponds to $\angle N$.  So our answer is $\angle N$.