Hey there!☺
[tex]Answer:\boxed{a=\frac{b-u}{k}}[/tex]
[tex]Explanation:[/tex]
[tex]u=b-ak[/tex]
In our first step, we will flip the equation:
[tex]-ak+b=u[/tex]
Now add -b to both sides:
[tex]-ak+b+-b=u+-b\\-ak=-b+u[/tex]
In our last step, we will divide both sides by -k:
[tex]\frac{-ak}{-k}=\frac{-b+u}{-k}\\a=\frac{b-u}{k}[/tex]
a=b-u/k is your answer.
Hope this helps!☺
