Question

D’(2, 9) is the image of D after a reflection in the line y -axis. What are the coordinates of D?

Answer 1

(-2,9)

Explanation:

The rule for a reflection over the y-axis is (-x,y). Because we are given the image, we can use this rule to find the preimage.

So to find the preimage, we reinsert the image values into the rule. This is because two reflections over the y-axis create your original shape. Doing so gives you (-(2), 9) or (-2,9)