2/3(x-y)-(x+y)=-1
2x-3y-3x-3y=-3
x+6y=3 (1)
6x+y-(2x-y)=16
5x+y-2x+y=16
3x+2y=16 (2)
(2)×3-(1)
9x-x=48-3
8x=45
所以x=45/8
y=(16-3x)/2=-7/16
2/3(x-y)-(x+y)=-1
2x-3y-3x-3y=-3
x+6y=3 (1)
6x+y-(2x-y)=16
5x+y-2x+y=16
3x+2y=16 (2)
(2)×3-(1)
9x-x=48-3
8x=45
所以x=45/8
y=(16-3x)/2=-7/16