I have to prepare the T-accounts but on 12-23 - PAID $170 TO XYZ COMPANY FOR SUPPLIES PURCHASED ON ACCOUNT; why would you enter on SUPPLIES but not SUPPLIES expense and would it be a debit or credit and why?

Began business by depositing $10000 in a bank account in the name of the company in exchange for 1000 shares of $10 per share common stock. 1-Dec 1-Dec Paid the rent for the current month, $1050 Paid the premium on a one-year insurance policy, $840 Purchased Equipment for $4800 cash Purchased office supplies from XYZ Company on account, $300 Provided services to customers for $7600 cash Provided service to customers ABC Inc. 1-Dec 1-Dec 5-Dec 15-Dec on account, $5800 16-Dec 21-Dec Received $2600 cash from ABC Inc., customer on account. Paid $170 to XYZ company for supplies purchased on account on 23-Dec December 5 28-Dec Paid wages for the period December 1 through December 28, $5040 30-Dec Declared and paid dividend to stockholders $200