`{(-2mx+y=4),(2x+my=2):}`

`<=> {(y=2mx+4),(2x+2m^2x+4m=2):}`

`<=> {(y=2mx+4),(x(2+2m^2)=2-4m):}`

`<=> {(y=2mx+4),(x=[1-2m]/[m^2+1]):}`

`<=> {(y=[2m-4m^2+4m^2+4]/[m^2+1]),(x=[1-2m]/[m^2+1]):}`

`<=> {(y=[2m+4]/[m^2+1]),(x=[1-2m]/[m^2+1]):}`

`->` Nghiệm `([1-2m]/[m^2+1]; [2m+4]/[m^2+1])`

`#2`