Question 54689
X+Y=500 OR X=500-Y NOW SUBSTITUTE (500-Y) FOR X IN EQUATION #1
WE GET 1.12(500-Y)+1.08Y=0
560-1.12Y+1.08Y=0 
-.04Y=-560
Y=-560/-.04
Y=14,000  THEN
X+14,000=500 
X=500-14,000 
X=-13,500 
PROOF
1.12(-13,500)+1.08*14,000=0 
-15,120+15,120=0 
0=0