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I've got a problem with Cartesian Geometry and cannot find a solution.

A will appretiate any help I can get.

b) Show that \(\displaystyle [AQ]\) has equation \(\displaystyle cx + by = -2ac\)

c) Prove that the third median \(\displaystyle [BR]\) passes through the point of intersection \(\displaystyle G\) of medians \(\displaystyle [OP]\) and \(\displaystyle [AQ]\)

Cheers!