exam Maths Puzzle Numerical Ability

I have to find the slope and y- intercept of the line for these three but i dont get how
4x+2y=32 i tried to work this out here
-4 -4
2y=-4x-32
y-2x=16
the next is 9x+3y=-81
2x-5y=10

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exam Other Question

Is this problem factored completely correctly?

3a^3+6a^2-2a-4

(3a^3)+(-2a-4)

(3a^3/3a^2+6a^2/3a^2)+ (-2a/-2-4/-2)

3a^2(a+2)+ -2(a+2)
(1a+2)(3a^2+-2)

How would you write the final answer?
21 ___ ___63___ ___ I am told that there is a strategy for finding missing numbers on a number line when the numbers are the same distance apart. I am helping my son with his home work and i need your help