Systems of Equations. 105 



f xy=i22$ Result, j>r= 49 or 25. 



\ \/x-{- \/j=i2. _>'=25or49. 



x-^j/^=a— \^ x-\-y 



x—y—b. 



Result, ^^2r^+_^j + i^V4^ + i 



4 



_ 2(a—b) -\-i±:s/ ^a-\-i 



4 



A— 13 



