2x-y-2=0 4x-3y-8=0 用加减消元法做
问题描述:
2x-y-2=0 4x-3y-8=0 用加减消元法做
答
2x-y-2=0
2x-y=2①
4x-3y-8=0
4x-3y=8②
①×2
4x-2y=4③
③-②
y=-4
x=-2