Question

Point A (4, –1) is reflected as A’ in the y-axis. Point B on reflection in the x-axis is mapped as B’ (–2, 5). Write down the co-ordinates of A’ and B.

Answer 1

Reflection in y-axis is given by M_y (x, y) = (–x, y)

A’ = Reflection of A(4, –1) in y-axis = (–4, –1)

Reflection in x-axis is given by M_x (x, y) = (x, –y)

B’ = Reflection of B in x-axis = (–2, 5)

Thus, B = (–2, –5)