Tentukan bayangan garis y = 5x + 4 oleh rotasi R(O, -90)

y=5x+4...> 5x-y+4=0
R (O,-90)...> R [O..1] [-1..O]
[x',y']= [O. 1] [1.O] (x, y)

x'=y...> y=x'
y'=-x..> x=-y'

5x-y+4=O.....> 5 (-y')-1 (x') +4=O
-x-5y+4=O
x+5y-4=O