get these right and ill give you brainlyest :D and a bonus of 50 points/ you need to tell me how i can give you the 50 points if you get the question right..

Answer:
5. 5k-4. 7. 13-8x. 9. 15x-5. 11. -1/4y +2
Step-by-step explanation:
it's all about combining the same variables