Which of the following points is symmetric with y=x at (2,3)?  Choices:  A) (-2,-1)  B) (-2,1)  C) (2,1)  D) (3,2)  E) (-1,2)
We can think of line y = x as a mirror. Any point (x,y) becomes (y,x) when it isreflectedover the mirror. Reverse the coordinate and keep the same sign. These two points will be symmetric to the line y = x.   (2,3) would become (3,2).   Answer ((3,2)).
<result>D</result>
Which of the following points is symmetric with y=x at (2,3)?