x/2+y/3=-3与 7x=8y-4求X、Y,

问题描述:

x/2+y/3=-3与 7x=8y-4求X、Y,

x/2+y/3=-3方程两边同时乘以24得:12x+8y=-72
7x=8y-4 可得8y=7x+4代入上式得12x+7x+4=-72 19x+4=-72 x=-4