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ABCDEFGH is a cube with a side of 3cm. The points I and J are defined by:

vector BI = 1/5 of vector BF

vector CJ = 4/5 of vector CG

The plan (EIJ) cuts line (HG) into K.

1. Prove that line (EK) and line (FG) are parallele.

Any suggestions on how to go about this?