The ordered pairs (2, –21) and (5, –45) are solutions to which of the following equations?

a. (x,y) -> (x - 4, y - 2)
b. (x,y) -> (x + 4, y - 2)
c. (x,y) -> (x + 4, y + 2)
d. (x,y) -> (x - 4, y + 2)

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