Given the equation:
![6q=3s-9](https://img.qammunity.org/2023/formulas/mathematics/college/d16cfv4jw3bcyb2jebz3dlvhmiccvh939g.png)
You need to write it in function notation, where "q" must be the independent variable.
You can follow these steps:
1. Knowing that "s" must depend on "q", you need to solve for "s":
![6q+9=3s](https://img.qammunity.org/2023/formulas/mathematics/college/zrxlr5sqewy8nuwd9gyatyqohixn13sxkr.png)
![(6q+9)/(3)=s](https://img.qammunity.org/2023/formulas/mathematics/college/3wlt8gvzxvcgwkkaykq6ngtukplnvg43b3.png)
![s=2q+3](https://img.qammunity.org/2023/formulas/mathematics/college/ro055pasgq0fv101onb2yufd1jupeaelqe.png)
2. Set up that:
![s=f(q)](https://img.qammunity.org/2023/formulas/mathematics/college/8ojkgaa9j4hv5k1qwkoj6z6lvqxvn00bo1.png)
And rewrite the equation:
![f(q)=2q+3](https://img.qammunity.org/2023/formulas/mathematics/college/mfrculz7d2bdf0r8q80qrsu8p8s4hea41m.png)
Hence, the answer is: Last option.