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If a $\triangle ABC$ has vertices $A(-1, 7)$, $B(-7, 1)$ and $C(5, -5)$, then its orthocentre has coordinates:
(1) $\left(-\frac{3}{5}, \frac{3}{5}\right)$
(2) $(-3, 3)$
(3) $\left(\frac{3}{5}, -\frac{3}{5}\right)$
(4) $(3, -3)$
BETA
