Tentukan koordinat peta titik A(3,-2) oleh pencerminan tehadap garis y =1 ! Tunjukkan hasilnya dengan sketsa !

....................|5........................
....................|4.................●A'(3,4)
....................|3..................|
....................|2..................|
....................|1...................|........( y = 1 )
..-2....-1......0.....1......2.....3....
....................|-1..................|
....................|-2................●A(3,-2)
....................|-3.........................

A(3,-2)=> (y = 1) => A'(3,2(1)-(-2))
=>A'(3,2-(-2))
=>A'(3,2+2)
=>A'(3,4)