titik A (3,5) pencerminan terhadap garis A=8 adalh ..

(3,5) terhadap y=8
= (A, 2x8 - b)
= (3, 2x8 - 5)
= ( 3, 16-5)
= ( 3, 11)

Refleksi

A(x,y) [Ry = b] --> A' (x , 2b - y]

A(3,5)  [Ry = 8]  --> A' {3, (2(8) - 5}  --> A'  (3, 11)