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(x,y) ⇒ (-y,x)
Sehingga.
x = y'
y' = -x'
Persamaan y = -3x + 1
Menjadi:
-x' = -3y' + 1
3y' = x' + 1
y' = 1/3 x + 1/3
Dan refleksi sumbu x.
Dari y menjadi -y
-y = 1/3 x + 1/3
y = -1/3 x - 1/3
Atau:
3y = -x - 1
x + 3y + 1 = 0