solve for m? y=mx+b??

solve for m? y=mx+b??

$\begin{array}{rcll} y &=& mx+b \quad & | \quad -b \\ y-b &=& mx \quad & | \quad :x \\ \dfrac{y-b}{x} &=& m \\ m &=& \dfrac{y-b}{x} \end{array}$