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saya buat matriks dengan titik sembarang
( x' ) = ( x+1 )
( y' ) = ( y+3 )
lalu jika x' =x+1 maka x=x'-1 (ini pindah ruas)
lalu jika y' =y+3 maka y=y'-3
substitusikan
y=2x+y
(y'-3)=2(x'-1)+(y'-3)
y-3=2x-2+y-3
y=2x+y-2
(saya rasa y seharusnya dapat dicoret)