If $f: \mathbb{R} \to \mathbb{R}$ is defined by $f(x) = 2x + 3$, then what is $f^{-1}(x)$?

Question

Is given by $\frac{x - 3}{2}$

Is given by $\frac{1}{2x + 3}$

Does not exist because 'f' is not injective

Does not exist because 'f' is not surjective

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