Question 137351
X+Y=13 OR X=13-Y
X=2Y+1
THEREFORE:
13-Y=2Y+1
-Y-2Y=1-13
-3Y=-12
Y=-12/-3
Y=4 ANSWER 
X=13-4
X=9 FOR THE LARGER NUMBER.
PROOF
9=2*4+1
9=9