bayangan titik (2,3) oleh refleksi terhadap garis y=-4 adalah

Pencerminan

(2,3) thd y = -4
x' = x = 2
y' = 2(-4) - 3 = -11

Bayangan = (2,-11) ✔

[tex] \left[\begin{array}{ccc}x'\\y'\end{array}\right]  \left[\begin{array}

{ccc}x\\y\end{array}\right] + \left[\begin{array}{ccc}0\\2h\end{array}\right] [/tex]

[tex] \left[\begin{array}{ccc}2+0\\-3+(-8)\end{array}\right][/tex]

=>
x'= 2
y'= -11

jadi, A' adalah (2,-11)