(I)4,5x+3,7y+3,6=0(II)12,15x+9,9y+9,72=0
(4,53,712,159,9)(xy)=(−3,6−9,72) (I)2,8x+4,6y+4,5=0(II)4,3x+6,9y+6,9=0
(I)3,6x+4,7y−6=0(II)9x+12y−12=0