Answer:
-3
Step-by-step explanation:
[tex] f(x) = -3x [/tex]
[tex] f(x + c) = -3(x + c) = -3x - 3c [/tex]
[tex] \dfrac{f(x + c) - f(x)}{(x + c) - x} = [/tex]
[tex] = \dfrac{-3x - 3c - (-3x)}{x + c - x} [/tex]
[tex] = \dfrac{-3x - 3c + 3x}{c} [/tex]
[tex] = \dfrac{-3c}{c} [/tex]
[tex] = -3 [/tex]
