X+y=8. X-y=2 elimination problem
X+Y=8 »» X=8-Y now we can substitute X with 8-Y in the second equation, which was X-Y=2X-Y=2 »» (8-Y)-Y=2 »» 8-2Y=2 »» 2Y=8-2 »» Y=6/2 »» Y=3since X=8-Y, and Y=3, so X=8-3=5X=5 and Y=3