Which situation describes using a debit card?

a.
tyler mailed a paper check to pay a bill.

b.
kim entered a pin to complete the transaction.

c.
victor bought an item and paid for it one month later.

d.
john deposited cash into a machine.

Mr. jones determined that the equation y = 98 - 16/5 x could be used to predict his students' unit test scores, based on the number of days, x, a student was absent during the unit. what was the meaning of the y-intercept of the function? (by the way the 16/5 is a )