# These Couple Lines

Geometry Level 4

$\begin{eqnarray} 3 l +m +5 n & =& 0 \\ 6 m n-2 n l+5 l m& =& 0 \\ \end{eqnarray}$

The pair of lines whose direction cosines are given by the two equations above are:

###### Image Credit: Wikimedia Cone by Lars H. Rohwedder
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