Ralph opens a bank account. The amount, in dollars, in the account x weeks after the account is opened can be modeled by function r. If Ralph has $7,000 in the account 15 weeks after the
account is opened, which TWO of the following must be true?
A. r (7000) = 15

B. In the xy-plane, point (7,000, 15) is on the graph of the equation.

C. r (15) = 7000

D. The point (15, 7000) is on the graph of the equation.