Looking at the description of the shape, The Reflect shape A in the line y = x, will then be (y, -x).
What does it mean to reflect a shape?
The Reflecting of a shape implies that one should turn it over a mirror line.
Note that in doing this, each part of the shape is said to be moved to the other side of the mirror line and as such it still have to be the same with the same distance away from the line. The image attached shows the best form of the reflected shape in line y = x.
Note that if one reflect over the line y = -x, the x-coordinate and y-coordinate tends to alter places and are then negated the line y = x is the change to (y, x).
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