Hello.
In order to make a variable the subject, we should isolate it.
In this case, the variable that we should isolate is y.
In order to isolate it, we should subtract x from both sides:
[tex]\sf{x-x+y=6-x[/tex]
[tex]\sf{y=6-x}[/tex]
Therefore, the answer is
[tex]\Large\boxed{y=6-x}[/tex]
I hope it helps.
Have an outstanding day.
[tex]\boxed{imperturbability}[/tex]
