1) 3X-5Y=-1 (1)
-2X+3Y=-11 (2)
(1)*2+(2)*3: -Y=-35 (3)
解出: Y=35 (4)
代入(1),解出 X=58 (5)
2) X=5Y-10 (1)
Y=2X-7 (2)
(1)+(2):X=17-4Y (3)
与(1)联立:解出:Y=3 X=5 .
1) 3X-5Y=-1 (1)
-2X+3Y=-11 (2)
(1)*2+(2)*3: -Y=-35 (3)
解出: Y=35 (4)
代入(1),解出 X=58 (5)
2) X=5Y-10 (1)
Y=2X-7 (2)
(1)+(2):X=17-4Y (3)
与(1)联立:解出:Y=3 X=5 .