Given the parent functions f(x) = 5x − 1 and g(x) = 3x − 9, what is g(x) − f(x)?

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Given the parent functions f(x) = 5x − 1 and g(x) = 3x − 9, what is g(x) − f(x)?
a. g(x) − f(x) = 3x − 8 − 5x
b. g(x) − f(x) = 3x − 10 − 5x
c. g(x) − f(x) = −2x − 8 − 3x
d. g(x) − f(x) = −2x − 10 − 3x