1.retta-per-2-punti.tex

\subsection{Retta $r$ per $A(1, 2, 2)$ e $B(3, 1, 0)$}
$\vec{d} = (1-3, 2-1, 2-0) = (-2, 1, 2)$
\begin{tabular}{@{}ll@{}}
	$\begin{cases}
		x = 1 - 2t \\[-0.3em]
		y = 2 + 1t \\[-0.3em]
		z = 2 + 2t \\
	\end{cases}$
	&
	\begin{tabular}{l}
		$t = y-2$ \\
		$\begin{cases}
		x + 2y - 5 = 0 \\[-0.3em]
		z - 2y +2 = 0 \\
		\end{cases}$ \\
	\end{tabular}
\end{tabular}