3x-2y-1=3y-2x-16=x-y=0 3x-2y-1=0.....(1) (1)*2 6x-4y-2=0.....(3) { { 3y-2x-16=0.....(2) (2)*3 -6x+9y-48=0.....(4) (4)+(3):5y-50=0 5y=50 y=10 代入(1):3x-2(10)-1=0 3x-20-1=0 3x=21 x=7 A:x=7,y=10