Shana and Bill are working together to solve the system by substitution. Shana wants to rewrite the first equation to solve for x. Bill wants to rewrite the second to solve for y. Who is correct? Why? Please help!

My besf helped me on some of it cause she good at math but she told me what to do and i took it from there my besf helped me on some of it cause she good at math but she told me what to do and i took it from there my besf helped me on some of it cause she good at math but she told me what to do and i took it from there with the answer from the box lolll my besf helped me on some of it cause she good at math but she told me what to do and i took it from there my besf helped me on some of it cause she good at math but she told me what to do and i took it from there my besf helped me on some of it cause she good at math but she told me what to do and i took it from there with the answer from the box lolll my besf helped me on some of it cause she good at math but she told me what to do and i took it from there my besf helped me on some of it cause she good at math but she told me what to do and i took it from there my besf helped me on some of it cause she good at math but she told me what to do and i took it from there with the answer from the box lolll my besf helped me on some of it cause she good at math but she told me what to do and i took it from there my besf helped me on some of it cause she good at math but she told me what to do and i took it from there my besf helped me on some of it cause she good at math but she told me what to do and i took it from there with the answer from the box lolll