Question

On a coordinate plane, a triangle has points A prime (6, 8), B prime (10, negative 6), and C prime (6, negative 6).
What is the pre-image of vertex A' if the image shown on the graph was created by a reflection across the y-axis?

(–8, –6)
(–6, 8)

Answer 1

(-6, 8)

Reflection across the y-axis changes (x, y) to (-x, y). Since A' = (6, 8), the pre-image is (-6, 8).