Question 47137
1000X+Y=75000
1200X+Y=85000    SUBTRACT 
---------------
-200X=-10000 OR 200X=10000 OR X=10000/200 OR X=50 THEN 1000*50+Y=75000 OR 
50000+Y=75000 OR Y=$ 25000 IS THE FIXED COST FOR THE CONCERT