What are the shapes new coordinates after this series of transformations

Question

Mary has a shape with the coordinates (0,0), (7,1), (7,6) and (3,5). She rotates it 90 degrees counter clockwise and reflects it over y=-2. What are the shape’s new coordinates?

Answer 1

(0,0) (7,1), (7,6), (3,6) rotated 90 degrees counterclockwise becomes

(0,0), (-1,7), (-6,7), (-6,3)

as (x,y) becomes (-y,x)

then reflect over the line y=-2 to get

(0,-4), (-1,-11), (-6,-11), (-6, -7)

(0,0) was 2 above -2.make it 2 below -2.

-2-2=-4

(-1,7) and (-6,7) were 9 above -2. make them 9 below

-2 -9=-11

(-6,3) was 5 above -2, make it 5 below

-2-5=-7