Question

Reflecting a Figure
On a coordinate plane, triangle A B C has points (negative 3, negative 1), (negative 2, negative 3), (2, negative 1).

Triangle ABC is reflected over the line y = 1. What are the coordinates of B’?


(–2, 3)
(–2, 5)
(2, –3)
(4, –3)

Answer 1

B = (−2, −3). Reflect across y = 1: y' = 2(1) − (−3) = 5, x' = −2. So B' = (−2, 5). Answer: (−2, 5).