1/2X-2/3Y=-2/15 (1)
1/2X-5/3Y=-4/3 (2)
(1)-(2)
1/2X-2/3Y-1/2X+5/3Y=-2/15+4/3
Y=6/5
代入(1)
1/2X-4/5=-2/15
1/2X=2/3
X=4/3
X=4/3,Y=6/5