Answer:
[tex]{ \tt{g(x) = 5x - 4}}[/tex]
• solve when x is a - 1:
[tex]{ \tt{g(a - 1) = 5(a - 1) - 4}} \\ \\ { \tt{g(a - 1) = 5a - 5 - 4}} \\ \\ { \boxed{ \tt{g(a - 1) = 5a - 9 \: }}}[/tex]
