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Two lines $\frac{x - 3}{1} = \frac{y + 1}{3} = \frac{z - 6}{-1}$ and $\frac{x + 5}{7} = \frac{y - 2}{-6} = \frac{z - 3}{4}$ intersect at the point $R$. The reflection of $R$ in the $xy$-plane has coordinates:
(1) $(2, -4, -7)$
(2) $(2, 4, 7)$
(3) $(2, -4, 7)$
(4) $(-2, 4, 7)$
BETA
