The coordinates of the vertices of △ LMN are L (-2, 4), M (3, -1), and N (0, -4). Determine whether △ LMN is a right triangle and support your decision. please give an explanation

Identify reflection rule on a coordinate plane that verifies that triangle a(-1,7), b(6,5), c(-2,2) and a’(-1,-7), b(6,-5), c’(-2,2) triangle are congruent when reflected over the x-axis