book Maths Puzzle Numerical Ability

find the slope of a line that is parallel to and slope of a line that is perpendicular to : y=8

Thanks a Ton!!

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book Other Question

GCF with negative coefficient

-18m^9-27m^6-27m^2
I got the answer -3m^2 Is that right?

thank you
Simplify a^1/3(a^6 +4a^12)