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\documentclass{article}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{multicol}
\usepackage{tikz}
\usetikzlibrary{positioning}
\usetikzlibrary{calc,through,backgrounds}
\usepackage{pstricks}
\usepackage{pst-node}
\usepackage{pst-plot}
\usepackage{pst-func}
\usepackage{pstricks-add}
\begin{document}
\paragraph{Example 8}
What is the $y$-intercept of the line shown in Figure 14? Is the slope positive or negative?
\vspace{.5in}
\begin{figure}[!h]
\centering
\begin{pspicture}(-4,-2)(5,2)
\psset{unit=.75cm}
\psaxes[linewidth=1.5pt]{<->}(0,0)(-4,-3)(4,4)[$x$,-90][$y$,180]
\psplot[plotstyle=curve,linewidth=1.5pt,arrows=<->]{-1}{3}{-1.5 x mul 3 add}
\end{pspicture}
\caption{}
\end{figure}
\paragraph{Answer: 3, negative}
\noindent To find the $y$-intercept, we are looking at where the graph (line) crosses the $y$-axis (vertical axis). We see that the $y$-intercept of this graph is 3. Since the line slants downwards from left to right we know that the slope is negative.
\end{document}
Nick