Question

State the co-ordinates of the images of the following points under reflection in the origin:

(iv) $(9,-9)$

Answer 1

Given point: $(9,-9)$

Reflection in the origin, $M_o(x,y)=(-x,-y)$

$\Rightarrow M_o(9,-9)=(-9,9)$

$\therefore$ The co-ordinates of the image of the given point under reflection in the origin are $(-9,9)$.