If y − 1 = 4x, which of the following sets represents possible inputs and outputs of the function, represented as ordered pairs?
a. {(1, 4), (2, 8), (3, 12)}
b. {(4, 1), (8, 2), (12, 3)}
c. {(0, 1), (1, 5), (2, 9)}
d. {(1, 0), (5, 1), (9, 2)}

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.