Question

If a ΔABC has vertice A(-1, 7), B(–7, 1) and C(5, –5), then its orthocentre has coordinates:

(1) (3, - 3)

(2) (3/5, 3/5)

(3) (-3, 3)

(4) (3/5, -3/5)

Answer 1

(3) (-3, 3)

Let orthocentre is H (x₀, y₀)