Answer:
There were 250 hamburgers sold
Step-by-step explanation:
h = hamburgers
c =cheeseburgers
c+h = 575
c =75+h
c+h =575
Substituting 75+h in for c in the second equation
75+h +h =575
Combine like terms
75+2h = 575
Subtract 75 from each side
75-75 +2h = 575-75
2h = 500
Divide each side by 2
2h/2 = 500/2
h = 250
There were 250 hamburgers sold