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Which of the following would be inappropriate to show that $\displaystyle {f{{\left({x}\right)}}}={7}{x}+{3}$ and $\displaystyle {g{{\left({x}\right)}}}=\frac{{{x}-{3}}}{{7}}$ are inverses of each other?

Show that $\displaystyle {f{{\left({g{{\left({x}\right)}}}\right)}}}={g{{\left({f{{\left({x}\right)}}}\right)}}}={x}$
Compare the graphs of $\displaystyle {f{{\left({x}\right)}}}$ and $\displaystyle {g{{\left({x}\right)}}}$
Show that $\displaystyle {f{{\left({x}\right)}}}$ and $\displaystyle {g{{\left({x}\right)}}}$ pass the horizontal line test
Compare the table values of $\displaystyle {f{{\left({x}\right)}}}$ and $\displaystyle {g{{\left({x}\right)}}}$
Find the Inverse of $\displaystyle {f{{\left({x}\right)}}}$ algebraically

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