4X+3Y=5 (1)
6x-5Y=7 (2)
(1)*3: 12x+9y=15 (3)
(2)*2:12x-10y=14 (4)
(3)-(4): 19Y=1
y=1/19 (5)
把（5）代入（1）求 x
解方程组{4X+3Y=5 6x-5Y=7的解
4X+3Y=5 (1)
6x-5Y=7 (2)
(1)*3: 12x+9y=15 (3)
(2)*2:12x-10y=14 (4)
(3)-(4): 19Y=1
y=1/19 (5)
把（5）代入（1）求 x