exam Maths Puzzle Numerical Ability

the problem is: 2y^2=14y. I need to solve this by factoring. The first thing I think I would do is factor out the greatest common factor which would be 2. I get to the point of 2(y^2-7y) but I am stuck on what y equals.
thanks,
Michael

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exam Other Question
Given the following system of equations, which statement is true?
y=1/4x+2
x=8y-12

Answer Choices:

A) y=8y-12+2
B) y=2y-1
C) x=1/4x+2
D) y=8y-12 Can you help me with this? It is so confusing on how to get the answer. Thank you.

x^2 - 3x = -6 - 1