{x+1=5y+2① {3x-9=2y+12②

问题描述:

{x+1=5y+2① {3x-9=2y+12②

由①得 x=5y+1 ③
将③代入②得 3(5y+1)-9=2y+12
15y+3-9=2y+12
y=18/13
将y=18/13代入③得 x=103/13