MathRevolution wrote:
Which of the following points is reflect to y=-x at (-2,1)?
A. (-1, 2) B. (1,-2) C. (2,1) D. (2,-1) E. (1,2)
When reflected about line y=-x the x co-ordinate -2 becomes y co-ordinate and y cordinate 1 becomes x co-ordinate.
Since (-2,1) is in 2nd quadrant we interchange signs annd get (-1,2)
So ans: A
