exam Maths Puzzle Numerical Ability

solve system by substitution

8x-4y=16
y=2x-4

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exam Other Question

Factor completely: x^3 - 2x^2 - 4x - 8

I have come up with varying answers for this problem, so am probably not working it correctly. Could you please show me the steps involve Tutor please help. Which two lines are parallel?

A) x+y=26 (B)2x+4y=15 (C)y=(2/3)x+14

I will be very grateful for your help.