Question

On a coordinate plane, a triangle has points R (negative 3, 4), T (negative 1, negative 4), and S (negative 4, negative 2).
What are the coordinates of the image of vertex R after a reflection across the y-axis?

(–4, 3)
(4, –3)
(–3, –4)
(3, 4)

Answer 1

Reflection across the y-axis sends (x, y) to (-x, y). So R(−3, 4) → (3, 4).

Answer: (3, 4)