How to reflect a triangle over the y=x line

The video tutorial explains how to plot and reflect coordinate points over the Y = X line. It begins with plotting original points, then describes the reflection process both graphically and algebraically. The tutorial demonstrates swapping X and Y coordinates to achieve reflection and concludes with plotting the new reflected points. Students are assigned similar tasks to practice the learned concepts.

Describe how to graph the line Y = X.

What is the significance of swapping the X and Y values in the reflection process?