根据题意列方程历渣组5x-2y=-71/3*x=2y+114/判掘3*x=-8x=-12/掘烂核7
根友正嫌据题意列方程组5x-2y=-71/3*x=2y+114/清脊3*x=-8x=-12/好手
把5x-2y=-7与1/3=2y+1连立成方程组。最后解得x=-2/7 y=-12/7