In a game, a person P at point (x,y) can jump to any one of the following points respectively: (x+1,y),(x+2,y),(x,y+1),(x,y+2). If P is at (0,0), then he can reach:
The image of a point P (2, 3) under reflection in the origin is P'(x, y). Write down the values of x and y.
If point P lies on the line y = -1, then its x and y coordinates are