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find the inverse function for f(x) = 4x - 9. if it , think of it as y = 4x - 9. below, you can just think of the f^-1 as y (but this time it's the y value for the inverse function).
a: f^-1(x) = 4(x + 9)
b: f^-1(x) = x/4 + 9
c: f^-1(x) = (x - 9) / 4
d: f^-1(x) = (x + 9) / 4
e: f^-1(x) = 4x + 9