X-coordinates don't change when a figure is reflected across the x-axis. The y-coordinates' signs, however, change. for example , if the starting point is (x, y), the reflected point is (x, -y). When you reflect a figure over the y-axis, the y-coordinates remain the same, but the signs of the x-coordinates flip. An example of this is if the initial point is (x, y), the reflected point is (-x, y).
