(y+1)/4 = (x+2)/3 .(1)2x-3y = 1 .(2)由（2）得：y=(2x-1)/3.(3)将（3）代入（1）得：{2(x-1)/3+1)/4 = (x+2)/33{2(x-1)/3+1) = 4(x+2)2(x-1) +3 = 4x+82x-2+3 = 4x+82x=-7x=-7/2将x=-7/2代回（3）得：y=(2x-1)/3 =...