∆ABC was transformed according to the rule (x, y) → (−y, x) to create ∆A'B'C'. What transformation justifies the relationship between the triangles?

Question

1.  A translation 1 unit to the left and 1 unit upward justifies ∆ABC ~ ∆A'B'C'. 
2. A reflection over the y-axis justifies ∆ABC ~ ∆A'B'C'. 
3. A rotation of 90° clockwise justifies ∆ABC ≅ ∆A'B'C'. 
4. A rotation of 90° counterclockwise justifies ∆ABC ≅ ∆A'B'C'.

Answer 1

3 is the only correct answer.

Answer 2

Diana you need to read/study the material on translations, rotations, and dilations.