tolong bantu jawab lah kak

[tex]y = \frac{4x + 1}{x + 4} \\ y(x + 4) = 4x + 1 \\ xy + 4y = 4x + 1 \\ xy - 4x = - 4y + 1 \\ x(y - 4) = - 4y + 1 \\ x = \frac{ - 4y + 1}{y - 4} \\ {f}^{ - 1} = \frac{ - 4x + 1}{x - 4} [/tex]
Maaf kalo salah, semoga membantu