Tentukan bayangan titik A(1,9) akibat refleksi a. garis x = 2 b. garis y = -1

jawab

A(x,y) = (1, 9)

a)  R garis x = a = 2
x' = 2a - x
x' = 2(2) - 1
x' = 3

y' = y = 9
bayangannya  A'(x',y')= (3, 9)

b. R garis  y = b = - 1
y' = 2b - y
y' = 2(-1)- 9
y' = - 11

x' = x = 2

Bayangan A' (x',y') = (2, -11)