Hi mike, I don’t know how to answer questions like these; would you tell me the right way to do so?

In the xy-coordinate plane, point P is the reflection of the point with coordinates (3,1) across the line y=x. Point T is the reflection of point P across the y axis. What are the coordinates of T?

A) (-3,1)

B) (-1,-3)

C) (-1,3)

D) (1,-3)

E) (3,-1)

You probably won’t need this for the SAT, but the reflection of a point across the *y* = *x* line is found by transposing the points. So the reflection of (3, 1) across *y* = *x* is (1, 3). Reflect that across the *y*-axis by negating the *x*-value to get (–1, 3).