[tex]\bf \begin{array}{l|lllll}
x&0&\underline{1.3}&2.6&3.9&\underline{5.2}\\\\
y&0&\underline{1}&2&3&\underline{4}
\end{array}\\\\
-------------------------------\\\\
\begin{array}{ccccccccc}
&&x_1&&y_1&&x_2&&y_2\\
% (a,b)
&&(~{{ 1.3}} &,&{{ 1}}~)
% (c,d)
&&(~{{5.2}} &,&{{ 4}}~)
\end{array}
\\\\\\
% slope = m
slope = {{ m}}\implies
\cfrac{\stackrel{rise}{{{ y_2}}-{{ y_1}}}}{\stackrel{run}{{{ x_2}}-{{ x_1}}}}\implies \cfrac{4-1}{5.2-1.3}\implies \cfrac{3}{3.9}[/tex]
simply pick two points to get the slope.
as far as graphing it, well, is a line, so to graph a line all you need is two points, so you have four there, pick any two points and graph a line through them.
