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\begin{frame}
  \frametitle{Polynomials of Degree 1: Linear Functions}
  
  \begin{block}{}
    A polynomial of degree $1$ is a \emph{linear function}:\vspace{-.5ex}
    \begin{talign}
      f(x) = mx + b
    \end{talign}\vspace{-3ex}
  \end{block}
  
  \begin{center}
  \scalebox{.6}{
  \begin{tikzpicture}[default]
    \diagram{-2}{4}{-2}{4}{1}
    \diagramannotatez
    \diagramannotatex{-1,1,2,3}
    \diagramannotatey{-1,1,2,3}
    \draw[cblue,ultra thick] plot[smooth,domain=-2:4,samples=20] (\x,{.5*\x - 1}) node[right] {$f$};
    \draw[cgreen,ultra thick] plot[smooth,domain=-1.5:1.5,samples=20] (\x,{2*\x +1}) node[right] {$g$};
    \draw[cred,ultra thick] plot[smooth,domain=-2:4,samples=20] (\x,{-.25*\x +3}) node[right] {$h$};
  \end{tikzpicture}
  }    
  \end{center}\vspace{-1ex}\pause
  \begin{exampleblock}{}
    Find equations for the functions $f$, $g$ and $h$:
    \begin{itemize}
      \pause
      \item for $f$: \pause $f(x) = \frac{1}{2}x-1$
      \item for $g$: \pause $f(x) = 2x+1$ 
      \item for $h$: \pause $f(x) = -\frac{1}{4}x+3$
    \end{itemize}
  \end{exampleblock}
\end{frame}