Question

kx-bf=fy/m solve for y

Answer 1

So you need to isolate y:
First you multiply m on both sides:
m(Kx - bf) = fy
Then, you divide f on both sides:
$\frac{(m(Kx-bf))}{f}$ = y

Answer 2

Multiply both sides by (m) and you get (mkx-mbf=fy)

Then divide both sides by (f) and you get ((mkx-mbf)/(f)) = y