Question

用简便方法解方程组3(x+y)+2(x-y)=36,2(x+y)-3(x-y)=24

Answer 1

3(x+y)+2(x-y)=36

5x+y=36 1

2(x+y)-3(x-y)=24

-x+5y=24 2

2*5+1 y+25y=156

y=6

将y=6代入1 5x+6=36

x=6