Question

根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y=

Answer 1

（x+y)-2(x-y)=11①

4(x+y)+3(x-y)=9②

②-①×4：11(x-y)=-35

（x-y)=-35/11

代入①：(x+y)-2(-35/11)=11

(x+y)=11-70/11

(x+y)=51/11