Which of the following points is symmetric with y=x at (1,2)?  Choose the correct answer:
A) (-2,-1)
B) (-2,1)
C) (2,1)
D) (-1,-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.   (1,2) would become (2,1).   Answer ((2,1)).
<result>C</result>
Which of the following points is symmetric with y=x at (1,2)?