Stretch or Compress Function Vertically: cf(x)

Let $f(x)$ be a real function, and $g(x) = 2f(x)$. Suppose the slope between points $(a,f(a)),(b,f(b))$ (on the graph $y = f(x)$) is $m$. What is the slope between $(a,g(a)),(b,g(b))$?