Question

The coordinates of point A are (-3a, 4b). If point A' is the image of point A reflected over the line y=x, the coordinates of A' are

1) (4b,-3a)
2) (3a,4b)
3) (-3a,-4b)
4) (-4b,-3a)

Answer 1

look here distence XY=YZ
because
mod(-3a-4b)/5=mod(4b+3a)/5
so 4b,-3a is the point