Question

Use the diagram to answer the question.

Information
A diagram.Short description, A diagram.,Long description,
A coordinate plane has five triangles. A dotted diagonal line showing y = x goes through the origin. Triangles A, B, and C are on the left side of the line; triangles E and D are on the right side of the line.

Triangle A is at (negative 8, 2); (negative 6, 2) and (negative 6, 5).
Triangle B is at (negative 8, negative 2); (negative 6, negative 2) and (negative 6, negative 5).
Triangle C is at (5, 6); (3, 9) and (5, 9).
Triangle D is at (6, negative 3); (8, negative 3) and (6, negative 6).
Triangle E is at (6, 2); (8, 2) and (6, 5).

Question
Which is the image of triangle E after a reflection over the y-axis?

Answer 1

Triangle A.

Reflection across the y-axis sends (x,y) to (−x,y), so E: (6,2),(8,2),(6,5) → (−6,2),(−8,2),(−6,5), which are the vertices of triangle A.