[Avenboy]

If supplies have a beginning balance of 1,245 and was debited for 2,860 for supplies purchased during the year. How do I journalize the adjusting entry required at the end of the year assuming the amount of supplies on hand is 1,349

[pready]

you need to compute how much of supplies have been used.
Beginning Balance + purchases - Ending Balance(supplies on hand) = amount used.

the adjusting entry is:
Debit Supplies Expense for the amount used
Credit Supplies for the amount used.