Question

Can anyone tell me where am i getting wrong.....the answer is -1....plz tell me my mistake...and don't try with another method...plz explain where i have done mistake and how to correct it... I'll mark you the brainliest...if it is helpful to me and also follow you​

Answer 1

Step-by-step explanation:

what's the question??. kindly write the question too.

Answer 2

$\mathtt{hello!}$

In that step you didn't change it to negative you wrote 9+y, but it should be 9-y

Have a good night