Answer:
On a coordinate plane, a triangle has points R prime (1, 2), S prime (3, negative 1), T prime (7, 1)
Step-by-step explanation:
We assume that the coordinates of the vertices of the given triangle are supposed to be ...
R(-2, 1), S(1, 3), T(-1, 7)
Then the given transformation (x, y) ⇒ (y, -x) will transform these to ...
R'(1, 2), S'(3, -1), T'(7, 1) . . . . . (matches the first choice)