用代入消元法:5(x+y)-3(x-y)=16 3(x+y)-5(x-y)=0
问题描述:
用代入消元法:5(x+y)-3(x-y)=16 3(x+y)-5(x-y)=0
用代入消元法:
5(x+y)-3(x-y)=16
3(x+y)-5(x-y)=0 求x和y的值
答
令x+y=m,x-y=n,则
5m-3n=16
3m-5n=0解的m=5,n=3
所以,x+y=5
x-y=3解得x=4,y=1