exam Maths Puzzle Numerical Ability

need help
Reduce (64y^3+27z^3)/(4y+3y) to lowest terms

choices are 16y^2+12yz-9z^2
4y+3z
16y^2-12yz+9z^2
already in lowest terms

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exam Other Question

Find the slope of a line that is perpendicular to the line connecting the points (6, 12) and (3, 5). Hi, I am trying to help my daugther, but I am having trouble explaining the problem without confusing her
6y-3y+2=-16
according to the book the answer is -6
Could someone please help me explain

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