exam Maths Puzzle Numerical Ability

Please help me to do this equation

Determine which two equations represent parrallel lines

A) Y= 5/3x +4 b) y= -3/5x -7 c) y=2x+8 d) y= 2x-4

Please let me know how to do this

Thanks

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exam Other Question

Write the equation of the line passing through (4, 4) and (4, 2).

A) y = 4 B) y = -2x C) x = 4 D) y = x + 4 http://www.hophost.net/DOWNLOAD/690251527/Proof.doc

Would it be possible to solve the proof on the link about for me. It is impossible and I cannot figure it out.