I need help on substituting and showing work :( and also don’t know if I got the right answer , helpppp :( !!

y = 52x + 248
x the number of hours since they opened
y the amount of boxes
After 8 hours: x = 8
y = 52*8 + 248 = 416 + 248
y = 664
After 8 hours there are 664 boxes