line 1...x / [ y-(5/9)]=9....x / [(9y-5)/9]=9....[9x / (9y-5)]=9.. . . . [x /(9y-5)]=1 . . . x=(9y-5) or 9y =x+5 . . . . or y=(x+5)/9 . . . line 2...x / [y-10/9] = 10...[9x / (9y-10)]=10....[x/(9y-10)]=10/9 . . . x=(10/9)*(9y-10) . . . x=10*(y-10/9) or y=(x/10) +(10/9) . . . thus, (x+5)/9 =(x/10)+(10/9) . . . . or 10(x+5) =9x +100 . . . 10x -9x =100-50 . . . x=50 . . . y=(x+5)/9=55/9=6.11111111111111111...