Question

A pre-image has coordinates Y(9,2),Z(3,-2) and W(6,4). The image has coordinates Y'(-9,2), Z'(-3,-2) and W'(-6,4). What type of reflection accoured? Explain how you know your answer is correct​

Answer 1

A reflection over the y-axis occurred.

In other words, the right side of the y-axis has positive x-values, and the left side of the y-axis has negative x-values. Since the x coordinates changed in sign (from positive to negative), they reflected over the y-axis.