Problem Solving (PS) | Re: Which of the following points is reflect to y=-x at (-2,1)?

When reflecting a point across the line y = -x, we can follow this rule:

If coordinates (a,b) are reflected across the line y = -x, then the new reflected coordinates are (-b, -a).

Thus, when (-2,1) is reflected across the line y = -x, the new reflected coordinates are (-1,2).

Answer: A