Reflections are a type of transformation. In this case, the line of reflection is the x-axis. The pre-image performs a "flip" over the line of reflection (x-axis), resulting in the image. The line of reflection is equidistant to each point on the pre-image and image. For example, point A on the pre image has the coordinates (-4,6) and A' on the image has the coordinates (-4,-6). Both points are equidistant from the line of reflection, as they are each 6 points away from it vertically. Also, the line of reflection creates a 90 degree angle with any segment connecting any point on the pre-image to the image.