exam Maths Puzzle Numerical Ability

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.

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exam Other Question

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 29. A bookstore can purchase several calculators for a total cost of $120. If each calculator cost $1 less, the bookstore could purchase 10 additional calculators at the same total cost. How many calculators can be purchased at the regular price?