[tex]\bf \begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
% (a,b)
c&({{ -2}}\quad ,&{{ 0}})\quad
% (c,d)
d&({{ 1}}\quad ,&{{ -3}})
\end{array}
\\\\\\
% slope = m
slope = {{ m}}= \cfrac{rise}{run} \implies
\cfrac{{{ y_2}}-{{ y_1}}}{{{ x_2}}-{{ x_1}}}\implies \cfrac{-3-0}{1-(-2)}\implies \cfrac{-3-0}{1+2}[/tex]
[tex]\bf y-{{ y_1}}={{ m}}(x-{{ x_1}})\qquad
\begin{array}{llll}
\textit{plug in the values for }
\begin{cases}
y_1=0\\
x_1=-2\\
m=\boxed{?}
\end{cases}\\
\textit{and move everything to the left}\\
\textit{leave the constant on the right}
\end{array}\\
\left. \qquad \right. \uparrow\\
\textit{point-slope form}[/tex]
